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EXERCISE

Co-ordination Compounds
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EXERCISE-I (Conceptual Questions) Build Up Your Understanding

TERMINOLOGY OF COORDINATION COMPOUND 8. Select the set representing correct statements only.
– (I) A coordination entity constitutes a central
1. In the complex ion [Fe(EDTA)] the coordination
metal atom or ion bonded to a fixed number
number and oxidation state of central metal ion is :- of ions or molecules.
(1) C.N. = 6 O.N. = +3 (II) Ligand having two different or similar donor
(2) C.N. =1 O.N. = –1 atoms in the complex is called bidentate ligand.
(3) C.N. = 4 O.N. = +2 (III) All bidentate ligands are chelating ligands.
+2 +3 +3
(4) C.N. = 3 O.N. = +3 (IV) Ni , Co and Fe are acting as Lewis acids in
CC0001 +2
[NiCl2(H2O)4], [CoCl(NH3)5] and [Fe(CN)6] .
–3

2. The coordination number and oxidation number of (1) I, II, III and IV (2) II and III

the central metal ion in the complex [Pt(en)2] is :-

+2 (3) I, III and IV (4) I, II and IV
CC0232
(1) C.N. = 2, O.N. = +2

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(2) C.N. = 6, O.N. = +4 9. Oxidation number of Cobalt in K[Co(CO)4] is :-
(3) C.N. = 4, O.N. = +4 (1) +1 (2) –1 (3) 0 (4) +2
(4) C.N. = 4, O.N. = +2 CC0233
CC0002 10. Which of the following species is not expected to
be ligand :-
3. Select bidentate or didentate ligand from the following. +

–
(1) NO (2) NH4
(1) CO (2) SCN
– 2–
(3) NH2CH2CH2NH2 (4) CO
(3) CH3COO (4) C2O4
CC0234
CC0003 11. Identify the statement which is not correct :-
4. The oxidation and coordination number of Pt in (1) Coordination compounds are mainly known
for transition metals.
[Pt(C2H4)Cl3]– is respectively :-
(2) Coordination number and oxidation state of
(1) + 1, 3 (2) + 2, 4 central metal atom in a complex is same.
(3) + 3, 6 (4) + 2, 5 (3) Ligand donates at least one electron pair to CMA
CC0004 +
(4) [Co(NH3)4Cl2] is a heteroleptic complex.
5. The CN and ON of X in the complex compound CC0235

[X(SO4)(NH3)5] will be respectively :- 12. Which of the following ligands will not show
chelation?
(1) 10 and +3 (2) 1 and +6
(1) EDTA (2) DMG
(3) 6 and +4 (4) 6 and +2 –
CC0005 (3) Ethane-1, 2 diamine (4) SCN
CC0236
6. What is the oxidation number of Fe in
2+
IUPAC - NOMENCLATURE
[Fe(H2O)5(NO)] ion?
(1) +2 (2) +3 13. K3[Fe(CN)6] is :-
(3) +1 (4) 0 (a) Potassium hexacyano ferrate (II)
CC0006 (b) Potassium hexacyano ferrate (III)
(c) Potassium ferri-cyanide
7. Which one is a heteroleptic complex ?
(d) Hexacyano ferrate (III) potassium
(1) Ferrocene (2) Chromocene
Correct answer is :-
(3) Prussian blue (4) Zeise's salt (1) Only (a) and (b) (2) Only (b) and (c)
CC0231 (3) Only (a) and (c) (4) Only (b) and (d)
CC0009
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14. Give the IUPAC name of the complex 21. The IUPAC name for [Co(NH3)6] [Cr(CN)6] is :-
compound [Co(NH3)4(H2O)Br](NO3)2. (1) Hexaammine cobalt (III) hexacyanochromate (III)
(1) Bromoaquotetraamine Cobalt (III) nitrate (2) Hexacyanochromium cobalt hexaammine (VI)
(2) Bromoaquotetraaminocobalt (III) nitrate
(3) Hexaammine cobalt (III) hexacyanochromium (VI)
(3) Bromoaquatetraammine cobaltate (III) nitrate
(4) Tetraammineaquabromido cobalt (III) nitrate (4) Hexacyanochromium (III) hexaammine cobalt (III)
CC0010 CC0017

15. Which of the following complex is anion :- 22. The IUPAC name for [Co(NCS) (NH3)5]Cl2 is :-
(1) Fluoro pentaammine cobalt(III) (1) Pentaammine (thiocyanato-N) cobalt (III) chloride
(2) Trioxalato ferrate(III) (2) Pentaammine (thiocyanato-S) cobalt (III) chloride
(3) Penta Carbonyl iron(0) (3) Pentaammine (isothiocyanato-N,S)cobalt (III)
(4) Dichloro diammine platinum(II) chloride
CC0011 (4) Pentaammine (mercapto-N) cobalt (III) chloride
CC0018
16. The chloro-bis (ethylenediamine) nitro cobalt (III)
23. Which rule is incorrect regarding IUPAC

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ion is :-
+
(1) [Co (NO2)2 (en)2 Cl2] (2) [CoCl (NO2)2 (en)2]
+ nomenclature of complex ions ?
+ – (1) Cation is named first and than anion is named
(3) [CoCl (en)2 NO2] (4) [Co (en) Cl2 (NO2)2]
(2) In the coordination sphere, the ligands are
CC0012
named alphabetically.
17. Which of the following complexes is not a chelate (3) Positively charged ligands have suffix-ate.
(1) bis (dimethylglyoximato) nickel(II) (4) More than one same type of ligands are
(2) Potassium ethylenediaminetetrathiocyanato indicated by di, tri, tetra etc.
chromate(III) CC0237
(3) Tetrammine dichlorocobalt(III) nitrate WERNER'S THEORY & EAN
(4) Trans–diglycinatoplatinum(II)
CC0013 24. Which of the following has least conductivity in
aqueous solution.
18. The correct IUPAC name of the complex (1) CoCl3⋅4NH3 (2) CoCl3⋅3NH3
5
[Fe(η –C5H5)2] is
(3) CoCl3⋅5NH3 (4) CoCl3⋅6NH3
(1) Cyclopentadienyl iron (II)
CC0020
(2) Bis (cyclopentadienyl) iron (II) +2
(3) Dicyclopentadienyl ferrate (II) 25. If EAN of a central metal ion X in a complex is
(4) Ferrocene 34. and atomic number of X is 28. The number
CC0014 of monodentate ligands present in complex are:-
(1) 3 (2) 4 (3) 6 (4) 2
19. The correct name of [Pt(NH3)4Cl2] [PtCl4] is :- CC0021
(1) Tetraammine dichloro platinum (IV) tetrachloro +
26. The EAN of cobalt in the complex ion [Co(en)2Cl2]
platinate (II)
is :-
(2) Dichloro tetra ammine platinum (IV) tetrachloro
platinate (II) (1) 27 (2) 36 (3) 33 (4) 35
(3) Tetrachloro platinum (II) tetraammine platinate(IV) CC0022
(4) Tetrachloro platinum (II) dichloro tetraamine 27. The effective atomic number of Cr (atomic no. 24)
platinate (IV) in [Cr(NH3)6] Cl3 is
CC0015 (1) 35 (2) 27 (3) 33
(4) 36
20. The IUPAC name of K2[Cr(CN)2O2(O)2(NH3)] is:- CC0023
(1) Potassiumamminedicyano 28. Which gives only 25% mole of AgCl, when
dioxoperoxochromate(VI)
reacts with AgNO3 :-
(2) Potassiumamminecyanoperoxodioxo chromium (VI)
(3) Potassiumamminecyanoperoxodioxo chromium (VI) (1) PtCl2.4NH3 (2) PtCl4.5NH3
(4) Potassiumamminecyanoperoxodioxo (3) PtCl4.4NH3 (4) PtCl4.3NH3
chromate (IV) CC0024
CC0016
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n+ n+
29. In the metal carbonyls of general formula M(CO)x 38. In the complex ion ML6 , M has five d-electrons
(Which follows EAN rule) if M is Ni, Fe and Cr and L is weak ligand then the magnetic
the value of x will be respectively:- properties of the complex ion correspond to how
(1) 6, 5, 6 (2) 4, 5, 6 (3) 4, 4, 5 (4) 4, 6, 6 many unpaired electrons
CC0025 (1) 0 (2) 5 (3) 2 (4) 3
CC0033
30. A compound has the empirical formula
39. A magnetic moment of 1.73 BM will be shown
CoCl3.5NH3. When an aqueous solution of this
compound is mixed with excess silver nitrate, 2 mol by one among of the following compounds .
2+ 2–
of AgCl precipitate per mol of compound. On (1) [Cu(NH3)4] (2) [Ni(CN)4]
+ 3–
reaction with excess HCl, no NH4 is detected. (3) TiCl4 (4) [CoCl6]
Hence it is CC0034
(1) Co(NH3)5Cl2]Cl (2) [Co(NH3)5Cl]Cl2 40. The magnetic property and the shape of
3+
(3) [Co(NH3)5Cl3] (4)[Co(NH3)4Cl2]Cl.NH3 [Cr(NH3)6] complex ions are :
CC0026 (1) Paramagnetic, Octahedral
31. Which is incorrect regarding Werner theory :- (2) Diamagnetic, square planar

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(1) Co-ordination compounds metals show two (3) Paramagnetic, tetrahedral
types of valancy. (4) None of the above
(2) Primary valency is satisfied by negative ions. CC0035
(3) Secondary valency is satisfied by only neutral
41. Amongest the following ions which one is high
molecules.
(4) Secondary valency is responsible for geometry spin complex.
2+ 3+
of complex. (1) [Cr(NH3)6] (2) [Fe(H2O)6]
1+ 2+
CC0238 (3) [Cu(H2O)4] (4) [Zn(H2O)6]
32. Number of electrolytes in the complex CC0036
CoCl3.5NH3 42. Which of the following complexes is an inner
(1) 3 (2) 2 (3) 4 (4) 5 orbital complex ?
CC0239 (1) [CoF6]
3–
(2) [FeF6]
3–

VALENCE BOND THEORY 3+ 2+

(3) [Cr(NH3)6] (4) [Fe(H2O)6]
33. Which of the following compound is paramagnetic CC0037
(1) Tetracyanonickelate (II) ion 43. What is Incorrect for K4[Fe(CN)6]
(2) Tetraamminezinc (II) ion (1) O.N of Iron is +2
(3) Hexaamine chromium (III) ion (2) It exhibit diamagnetic character
(4) Diammine silver (I) ion
(3) It exhibit paramagnetic character
CC0028 2 3
+ (4) It involves d sp hybridisation
34. The shape of the complex [Ag(NH3)2] is :
CC0039
(1) Octahedral (2) Square planar
(3) Tetrahedral (4) Linear 44. In which of the following molecules, central atom
CC0029 used orbitals of different principle quantum
35. Hexafluoroferrate(III) ion is an outer orbital number in the hybridisation :-
+2
complex. The number of unpaired electrons are (1) [Fe(CO)5] (2) [Zn(NH3)6]
+2
(1) 1 (2) 5 (3) 4 (4) 3 (3) [Ni(CO)4] (4) [Ni(NH3)6]
CC0030 CC0040
36. The shape of [Cu(NH3)4]SO4 is : 45. What are the geometric shape and the oxidation
(1) Square planar (2) Pyramidal number of the copper atom, respectively, for the
(3) Octahedral (4) Tetrahedral 2+
complex ion, [Cu(NH3)4(OH2)2] ?
CC0031
(1) Tetrahedral; + 2
37. Among the following ions, which one has the (2) Square planar; – 2
highest paramagnetism ? (3) Linear; + 3
3– 2+
(1) [FeF6] (2) [Fe(H2O)6] (4) Octahedral; + 2
2+ 2+
(3) [Cu(H2O)6] (4) [Zn(H2O)6] CC0041
CC0032

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3– 3– –3
46. For [FeF6] and [Fe(CN)6] magnetic moment of 53. The hybridisation in [Co(C2O4)3]
the fluoride complex is expected to be :- (1) sp d
3 2
(2) sp d
3 3

(1) The same as the magnetic moment of the 3 2 3

(3) dsp (4) d sp
cyanide complex
(2) Larger than the magnetic moment of the CC0241
cyanide complex because there are more 54. Which complex is diamagnetic ?
unpaired electrons in the fluoride complex (1) [ MnO4]
–
(2) [Co (NH3)6]
+2

(3) Smaller than the magnetic moment of the –3 +3

(3) [Fe(CN)6] (4) [Cr(H2O)6]
cyanide complex because there are more
unpaired electrons in the fluoride complex CC0242
(4) Larger than the magnetic moment of the
CFT, COLOUR OF THE COMPLEX AND STABILITY
cyanide complex because there are fewer
unpaired electrons in the fluoride complex 55. Which one of these ions absorbs energy from
CC0042 visible spectrum :-
47. Which of the following contains one unpaired + +2

®
(1) [Cu(NH3)4] (2) [Cu(NH3)4]
electron in the 4p orbitals :-
+2 –2
(1) [Cu(NH3)2]
+
(2) [Cu(NH3)4]
2+
(3) [Zn(H2O)6] (4) [CdCl4]
3– 2–
(3) [Cu(CN)4] (4) [Ni(CN)4] CC0049
CC0043 +2
56. In the complex [Ni(H2O)2(NH3)4] the magnetic
48. How many unpaired electrons are present in the
Brown Ring complex [Fe(H2O)5(NO)]SO4 moment (µ) of Ni is :-
(1) 4 (2) 3 (3) 0 (4) 5 (1) Zero (2) 2.83 BM
CC0045 (3) 1.73 BM (4) 3.87 BM
49. Which of the following statements about CC0050
[Cr(CO)6] is correct ?
(1) It is paramagnetic and inner orbital complex 57. Which of the following system has maximum
(2) It is diamagnetic and inner orbital complex number of unpaired electrons :-
(3) It is diamagnetic and outer orbital complex 5
(1) d (Octahedral, low spin)
(4) It is paramagnetic and outer orbital complex
8
CC0046 (2) d (Tetrahedral)
6
2+ (3) d (Octahedral, low spin)
50. Which is true for complex [Ni(en)2] ?
3
2
(1) paramagnetism, dsp , square planar,C.N. of Ni =2 (4) d (Octahedral)
2
(2) diamagnetism, dsp , square planar, C.N. of Ni = 4 CC0051
3
(3) diamagnetism, sp , tetrahedral, C.N. of Ni = 4
3 58. In an octahedral crystal field, the t2g orbitals are
(4) paramagnetism, sp , tetrahedral, C.N. of Ni = 4
CC0047 (1) Raised in energy by 0.4 ∆0
51. Arrange the following in order of decreasing (2) Lowered in energy by 0.4 ∆0
number of unpaired electrons :
2+ 3– (3) Raised in energy by 0.6 ∆0
Ι : [Fe(H2O)6] ΙΙ : [Fe(CN)6]
ΙΙΙ : [Fe(CN)6]
4–
ΙV : [Fe(H2O)6]
3+ (4) Lowered in energy by 0.6 ∆0
(1) ΙV, Ι, ΙΙ, ΙΙΙ (2) Ι, ΙΙ, ΙΙΙ, ΙV CC0052
(3) ΙΙΙ, ΙΙ, Ι, ΙV (4) ΙΙ, ΙΙΙ, Ι, ΙV 59. If ∆0 < P, the correct electronic configuration for
CC0048 4
–2 d system will be :-
52. Spin magnetic moment of [MnBr4] is 5.9 BM its
geometry would be :-
4
(1) t2g e0g 3
(2) t2g e1g
(1) Square planer (2) Tetrahedral (3) t2g
0
e 4g (4) t22g e2g
(3) Square pyramidal (4) Octahedral
CC0053
CC0240
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60. Match List–I (Complex ions) with List–II (Number 66. Which of the following complex can not exhibit
of Unpaired Electrons) and select the correct geometrical isomerism :-
answer using the codes given below the lists :- (1) [Pt(NH3)2Cl NO2] (2) [Pt(gly)2]
List –I List II +2
(3) [Cu(en)2] (4) [Pt(H2O)(NH3)BrCl]
(Complex ions) (Number of
CC0062
Unpaired Electrons)
4–
67. Which one of the following compounds will
A. [CrF6] i. One exhibit linkage isomerism :-
4–
B. [MnF6] ii. Two (1) [Pt (NH3)2 Cl2] (2) [Co (NH3)3 NO2]Cl2
4–
C. [Cr(CN)6] iii. Three
(3) [Co (NH3)4 Cl2]Cl (4) [Co (en)2Cl2]Cl
4–
D. [Mn(CN)6] iv. Four CC0063
v. Five
68. The compound [Cr(H2O)6]Cl3 and
Code : A B C D
(1) iv i ii v [Cr(H2O)4Cl2]Cl.2H2O respresent
(2) ii v iii i (1) Linkage isomerism (2) Hydrate isomerism
(3) iv v ii i (3) Ligand isomerism (4) Ionisation isomerism

®
(4) ii i iii v CC0066
CC0054 A
A B
61. Consider the following complex formation
reactions and comment on their formation 69. Compound - M
constant value
B A
K
 Fe ( NH3 )6 
2+
(i) Fe2+ ( aq ) + 6NH3 

f

A
K ′f
 [ Fe ( en )3 ]
2+
(ii) Fe 2+
( aq ) + 3en 

 can be marked as -
(1) Cis form (2) Leavo form
(1) Kf>K'f (2) Kf<Kf'
(3) Dextro form (4) Trans form
(3) Kf=Kf' (4) can not be compared CC0067
CC0055
62. Select most stable complex :- 70. A Planar Complex [Mabcd] gives :-
3+ +3
(1) [Co(H2O)6] (2) [Co(NH3)2(en)2] (1) Two Optical isomer
+3 +3
(3) [Co(en)3] (4) [Co(NH3)4(en)] (2) Two geometrical isomer
CC0056 (3) Three optical isomer
63. Red color of gem stone ruby is due to impurities of:- (4) Three geometrical isomers
+3 CC0068
(1) Al2O3 (2) Cr
+3
(3) Al ions (4) All of these 71. No. of geometrical isomers expected for octahedral
CC0059 complex [Mabcdef] is :-
ISOMERISM (1) Zero (2) 30 (3) 15 (4) 9
64. A square planar complex is cis platin [Pt(NH3)2Cl2] CC0069
shows : 72. Which of the following complex produce ppt
(1) Geometrical isomerism(2) Optical isomerism with AgNO3 and exist in two geometrical
(3) Linkage isomerism (4) Ionisation isomerism isomeric form
CC0060
(1) PtCl2.4NH3 (2) PtCl2.3NH3
65. The two compounds sulphato penta-ammine
(3) PtCl4.4NH3 (4) PtCl4.2NH3
cobalt (III) bromide and penta-amminebromo
CC0070
cobalt (III) sulphate represent :
73. Cis[Pt(en)2Br2]Cl2.2H2O and
(1) Linkage isomerism
(2) Ionisation isomerism trans[Pt(en)2Br2]Cl2.2H2O are :-
(3) Co-ordination isomerism (1) Ionisation isomer (2) Geometrical isomer
(4) Hydrate isomerism (3) Hydrate isomer (4) Optical isomers
CC0061 CC0071

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74. Which of the following octahedral complex have ORGANOMETALLIC COMPOUNDS
maximum stereoisomers :- 81. Which of the following is π –acid ligand
(1) [Fe(CN)6] –4
(2) [Co(en)(CN)4] –1
(1) NH3 (2) CO
(3) [Co(en)2(Cl)2] +
(4) [Co(en)3]+3 (3) glycinato (4) ethylene diamine
CC0072 CC0077
75. Which of the following complex does not show 82. Which of the following statement is/are wrong:-
geometrical isomerism ?
+ (a) Al4C3 is an organometallic compound
(1) [Co (NH3)4 Cl2 ] (2) [Co (NH3)3 (NO2)3]
3+ (b) Metal carbonyls are organometallic compounds
(3) [Cr (en)3 ] (4) [Pt (gly)2]
(c) TEL is π bonded organometallic compound
CC0073
(d) Frankland reagent is σ - bonded organometallic
76. Which of the following complex compounds does
compound
not exhibits geometrical isomerism ?
The answer is:-
(1) [PtCl2(NH3)2] (2) [PdCl2BrΙ]

®
(1) c and d (2) a and c
(3) [Pt(NH3) (py) (Cl) (Br)] (4) [Pt(NH3)3(Br)]
(3) a and b (4) b & d
CC0075
CC0078
77. The pair of molecules that exhibit geometrical
isomerism are 83. Compounds which contain direct metal carbon
+
(1) [ Cr(NH3)4Cl2] and [Co(NH3)3Cl3] bonds are called :

(2) [Cr (NH3)5Cl]

2+
and [Co(NH3)5Cl]
2+ (1) Organic compound (2) Complex compound

(3) [Cr(NH3)6]
3+
and [Co(NH3)6]
3+ (3) Metal carbides (4) OMC compounds.
(4) All of the above show geometric isomerism CC0079
CC0076 84. Which one of the following is a π bonded OMC ?
78. Complex [Co(NH3)3 (NO2)3] show which isomerism:- (1) Wilkinson's catalyst (2) Tetraethyl lead
(1) Ionisation and linkage
(3) Zeise's salt (4) Grignard's reagent
(2) Linkage and geometrical
CC0080
(3) Geometrical and ligand
(4) Coordination and linkage 85. Which of the following statement is true
CC0243 (1) FeCO3 and Fe3C are organometallic compounds.
79. Which of the following represents incorrect match?
(2) In ferrocene ligand is cyclopentadienyl.
(1) [Co(NH3)5(NO2)](NO3)2 : Linkage isomerism
(3) Pb (C2H5)4 is π-bonded OMC
(2) [Pt (NH3)(H2O)Cl2] : Geometrical isomerism
3
(4) In zeise salt central metal is sp hybridised.
(3) K[Cr(H2O)2(C2O4)2] : Geometrical and optical
CC0081
(4) [Cr(H2O)5Cl]Cl2H2O : Hydrate and linkage
isomerism 86. Which of the following is not an organo metallic
CC0244 compound :-
80. CrCl3.6H2O show 3 different coloured (1) (C2H5)2Zn (2) CH3B(OCH3)2
compounds due to :- (3) B(OCH3)3 (4) Ni(CO)4
(1) Ionisation isomerism CC0084
(2) Coordination isomerism
87. Number of metal -metal bonds in [Co2(CO)8] will
(3) Optical isomerism
be :-
(4) Hydrate isomerism
(1) 0 (2) 3 (3) 2 (4) 1
CC0245
CC0246

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APPLICATION OF COORDINATION CHEMISTRY 92. K4[Fe(CN)6] reacts with FeCl3 to form :-
88. In a ferric salt on adding K4[Fe(CN)6] a prussian (1) K3[Fe(CN)6] (2) K4[Fe(CN)3Cl3]
blue is obtained which is :-
(3) K3[Fe(CN)5Cl] (4) KFe[Fe(CN)6]
(1) K3[Fe(CN)6] (2) Fe3[Fe(CN)6]4
CC0090
(3) FeSO4[Fe(CN)6] (4) Fe4[Fe(CN)6]3
93. A reagent used for identifying nickel ion is :-
CC0086
(1) Potassium ferrocyanide
89. Hypo is used in photography because it is :-
(2) Phenolphthalein
(1) A reducing agent
(3) Dimethyl glyoxime
(2) An oxidising agent
(4) EDTA
(3) A Complexing agent
CC0091
(4) Photo sensitive Compound
CC0087 94. Which one of the following statement is false for

®
90. The solubility of AgBr in hypo solution is due to nickel-dimethylglyoximate complex ?
the formation of :- (1) The stability of complex is only due to the

(1) Ag2SO3 (2) Ag2S2O3 presence of intra-molecular hydrogen bonding

– 3– (2) The complex is stable, only because dimethyl
(3) [Ag(S2O3)] (4) [Ag(S2O3)2]
glyoxime ligand is a stronger ligand
CC0088
(3) The complex is stable as it has five membered
91. Which of the following is related to Nessler's reagent?
chelate rings as well as intra molecular
(1) PtCl4 + KCl→ (2) AgCl +NH3→
hydrogen bonding
(3) AgBr + Na2S2O3→ (4) HgI2 + KI→
(4) (1) and (2) both
CC0089
C0092

EXERCISE-I (Conceptual Questions) ANSWER KEY

Que. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Ans. 1 4 4 2 4 3 4 1 2 2 2 4 2 4 2
Que. 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Ans. 3 3 2 1 1 1 1 3 2 2 2 3 4 2 2
Que. 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
Ans. 3 1 3 4 2 1 1 2 1 1 2 3 3 1 4
Que. 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60
Ans. 2 2 2 2 2 1 2 4 1 2 2 4 2 2 3
Que. 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75
Ans. 2 3 2 1 2 3 2 2 4 4 3 3 2 3 3
Que. 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90
Ans. 4 1 2 4 4 2 2 4 3 2 3 4 4 3 4
Que. 91 92 93 94
Ans. 4 4 3 4

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EXERCISE-II (Previous Year Questions) AIPMT/NEET

AIPMT 2006 2– 3– 2–
8. Out of TiF6 , CoF6 , Cu2Cl2 and NiCl4
1. Copper sulphate dissolves in excess of KCN to give
colourless species are :
(1) Cu(CN)2 (2) CuCN 3–
(1) CoF6 and NiCl4
2– 2–
(2) TiF6 and CoF6
2–
3– 2–
(3) [Cu(CN)4] (4) [Cu(CN)4] (3) Cu2Cl2 and NiCl4
2– 2–
(4) TiF6 and Cu2Cl2
CC0096
CC0108
2. [Co (NH3)4 (NO2)2 ] Cl exhibits 9. Which of the following does not show optical
(1) linkage isomerism, geometrical isomerism isomerism?
and optical isomerism 3+ +
(1) [Co(en)3] (2) [Co(en)2Cl2]
(2) linkage isomerism, ionization isomerism and 0 +
optical isomerism (3) [Co(NH3)3Cl3] (4) [Co(en)Cl2(NH3)2]
(3) linkage isomerism, ionization isomerism and CC0109
geometrical isomerism 10. Which one of the following complexes is not
(4) ionization isomerism, geometrical isomerism expected to exhibit isomerism :-
and optical isomerism 2–
(1) [Pt (NH3)2 Cl2] (2) [NiCl4]

®
CC0097 2+ 2+
(3) [Ni (en)3] (4) [Ni(NH3)4(H2O)2]
AIPMT 2007
CC0110
3. Which of the following will give a pair of AIPMT 2010
enantiomers 11. Which of the following complex ion is not
(1) [Cr(NH3)6][Co(CN)6] (2) [Co(en)2Cl2]Cl expected to absorb visible light ?
2+ 2–
(3) [Pt(NH3)4][PtCl6] (4) [Co(NH3)4Cl2]NO2 (1) [Ni(H2O)6] (2) [Ni(CN)4]
CC0103 (3) [Cr(NH3)6]
3+
(4) [Fe(H2O)6]
2+

2+ 2+ 2+
4. The d electron configurations of Cr , Mn , Fe CC0111
2+ 4 5 6 8
and Ni are 3d , 3d , 3d and 3d respectively. 12. The existence of two different coloured complexes
+
Which one of the following aqua complexes will with the composition of [Co(NH3)4Cl2] is due to:-
exhibit the minimum paramagnetic behaviour (1) Ionization isomerism
2+ 2+
(1) [Fe(H2O)6] (2) [Ni(H2O)6] (2) Linkage isomerism
(3) [Cr(H2O)6]
2+
(4) [Mn(H2O)6]
2+ (3) Geometrical isomerism
(4) Coordination isomerism
CC0104
CC0112
AIPMT 2008 4
13. Crystal field stabilization energy for high spin d
5. Which of the following complexes exhibits the octahedral complex is :-
highest paramagnetic behaviour ? Where gly = (1) –0.6 ∆0 (2) –1.8 ∆0
glycine, en = ethylenediamine and bpy=bipyridyl
(3) –1.6 ∆0 + P (4) –1.2 ∆0
(At. No. Ti = 22, V = 23, Fe = 26, Co = 27)
– 3+ CC0113
(1) [Co(OX)2(H2O)2] (2) [Ti(NH3)6]
+ 2+ AIPMT Pre. 2011
(3) [V (gly)2(OH)2(NH3)2]
(4) [Fe(en) (bpy) (NH3)2]
CC0105 14. Of the following complex ions, which is diamagnetic
6. In which of the following coordination entities in nature ?
2– 2–
the magnitude of ∆o (CFSE in octahedral field) (1) [NiCl4] (2) [Ni(CN)4]
2– 3–
will be maximum ? (3) [CuCl4] (4) [CoF6]
(1) [Co(CN)6]
3–
(2) [Co(C2O4)3]
3–
CC0116
3+ 3+
(3) [Co(H2O)6] (4) [Co(NH3)6] 15. The complex [Co(NH3)6][Cr(CN)6] and [Cr(NH3)6]
CC0106 [Co(CN)6] are the examples of which type of
AIPMT 2009 isomerism ?
7. Which of the following complex ions is expected (1) Linkage isomerism
to absorb visible light? (2) Ionization isomerism
2+ 3+
(1) [Zn(NH3)6] (2) [Sc(H2O)3(NH3)3] (3) Coordination isomersim
(3) [Ti(en)2(NH3)2]
4+
(4) [Cr(NH3)6]
3+
(4) Geometrical isomerism
CC0107 CC0117

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16. The complex [Pt(Py)(NH3)BrCl] will have how AIPMT 2014
many geometrical isomers ? 23. Which of the following complexes is used to be
(1) 3 (2) 4 (3) 0 (4) 2 as an anticancer agent?
CC0118
(1) mer-[Co(NH3)3Cl3] (2) cis-[PtCl2(NH3)2]
AIPMT Mains 2011
(3) cis-K2[PtCl2Br2] (4) Na2CoCl4
17. Which of the following carbonyls will have the CC0127
strongest C–O bond ? AIPMT 2015
(1) [Fe(CO)5] (2) [Mn(CO)6 ]+
24. Cobalt (III) chloride forms several octahedral
(3) [Cr(CO)6] (4) [V(CO)6 ]– complexes with ammonia. Which of the
CC0119 following will not give test of chloride ions with
18. Which of the following complex compounds will silver nitrate at 25ºC?
exhibit highest paramagnetic behaviour :- (1) CoCl3·4NH3 (2) CoCl3·5NH3
(At. No. Ti = 22, Cr = 24, Co = 27, Zn = 30) (3) CoCl3·6NH3 (4) CoCl3·3NH3
(1) [Zn(NH3)6]
2+
(2) [Ti(NH3)6]
3+
CC0130
3+ 3+ 3–
25. Which of these statements about [Co(CN)6] is true:-

®
(3) [Cr(NH3)6] (4) [Co(NH3)6]
3–
CC0120 (1) [Co(CN)6] has four unpaired electrons and
AIPMT Pre. 2012 will be in a low-spin configuration.
3–
19. Which one of the following is an outer orbital (2) [Co(CN)6] has four unpaired electrons and
complex and exhibits paramagnetic behaviour? will be in a high spin configuration.
3–
(1) [Cr(NH3)6]
3+
(2) [Co(NH3)6]
3+ (3) [Co(CN)6] has no unpaired electrons and
2+ 2+ will be in a high-spin configurtion.
(3) [Ni(NH3)6] (4) [Zn(NH3)6] 3–
CC0123 (4) [Co(CN)6] has no unpaired electrons and
will be in a low-spin configuration.
AIPMT Mains 2012
CC0131
20. Red precipitate is obtained when ethanol solution of Re-AIPMT 2015
dimethylglyoxime is added to ammoniacal Ni(II). 3–
Which of the following statements is not true ? 26. The name of complex ion, [Fe(CN)6] is :-
(1) Tricyanoferrate (III) ion
OH
H3C – C = N (2) Hexacyanidoferrate (III) ion
dimethylglyoxime =
(3) Hexacyanoiron (III) ion
H3C – C = N (4) Hexacyanitoferrate (III) ion
OH
CC0132
(1) Red complex has a tetrahedral geometry. 2–
(2) Dimethylglyoxime functions as bidentate ligand. 27. The hybridization involved in complex [Ni(CN)4]
(3) Red complex has a square planar geometry. is (At.No. Ni = 28)
2 2 2 3 2 3
(4) Complex has symmetrical H-bonding. (1) d sp (2) d sp (3) dsp (4) sp
CC0124 CC0133
21.
6
Low spin complex of d –cation in an octahedral 28. The sum of coordination number and oxidation
field will have the following energy :- number of the metal M in the complex
(∆0 = Crystal field splitting energy in an octahedral [M(en)2(C2O4)]Cl (where en is ethylenediamine) is:-
field, P = Electron pairing energy) (1) 7 (2) 8 (3) 9 (4) 6
CC0134
−2 −2
(1) ∆0 + 2P (2) ∆0 + P 29. Number of possible isomers for the complex
5 5
[Co(en)2Cl2] Cl will be : (en = ethylenediamine)
−12 −12
(3) ∆0 + P (4) ∆0 + 3P (1) 3 (2) 4 (3) 2 (4) 1
5 5 CC0135
CC0125
NEET-I 2016
NEET-UG 2013
22. A magnetic moment of 1.73 BM will be shown 30. Which of the following has longest C–O bond
by one among the following :- length? (Free C–O bond length in CO is 1.128Å).
4– 2+
(1) [CoCl6] (2) [Cu(NH3)4] (1) Ni(CO)4 (2) [Co(CO)4]
2– 2– +
(3) [Ni(CN)4] (4) TiCl4  (3) [Fe(CO)4] (4) [Mn(CO)6]
CC0126 CC0138
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NEET-II 2016 37. The geometry and magnetic behaviour of the

31. The correct increasing order of trans-effect of the complex [Ni(CO)4] are
following species is : (1) square planar geometry and diamagnetic
– – –
(1) Br > CN > NH3 > C6H5 (2) tetrahedral geometry and diamagnetic
– – –
(2) CN > Br > C6H5 >NH3 (3) square planar geometry and paramagnetic
– – –
(3) NH3 > CN > Br > C6H5 (4) tetrahedral geometry and paramagnetic
– – –
(4) CN > C6H5 > Br > NH3 CC0152
CC0139
32. Jahn-Teller effect not observed in high spin 38. Iron carbonyl, Fe(CO)5 is
complexes of :- (1) tetranuclear (2) mononuclear
4 9 7 8
(1) d (2) d (3) d (4) d (3) trinuclear (4) dinuclear
CC0140
CC0153
NEET(UG) 2017 NEET(UG) 2019
33. An example of a sigma bonded organometallic
39. What is the correct electronic configuration of

®
compound is :
the central atom in K4[Fe(CN)6] based on crystal
(1) Grignard's reagent (2) Ferrocene
field theory ?
(3) Cobaltocene (4) Ruthenocene
CC0147
4
(1) t2g e2g 6
(2) t2g e0g (3) e3 t23 (4) e 4 t22

34. Pick out the correct statement with respect to CC0247

3– NEET(UG) 2019 (ODISHA)
[Mn(CN)6] :-
3 2 40. The Crystal Field Stabilisation Energy (CFSE) for
(1) It is sp d hybridised and tetrahedral
4– –1 2–
2 3 [CoCl6] is 18000 cm . The CFSE for [CoCl4]
(2) It is d sp hybridised and octahedral
2
will be-
(3) It is dsp hybridised and square planar –1 –1
3 2
(1) 6000 cm (2) 16000 cm
(4) It is sp d hybridised and octahedral –1 –1
(3) 18000 cm (4) 8000 cm
CC0148
CC0248
35. Correct increasing order for the wavelengths of
NEET(UG) 2020
absorption in the visible region the complexes of
3+
Co is :- 41. Which of the following is the correct order of
3+ 3+
(1) [Co(H2O)6] , [Co(en)3] , [Co(NH3)6]
3+ increasing field strength of ligands to form
3+ 3+ 3+ coordination compounds ?
(2) [Co(H2O)6] , [Co(NH3)6] , [Co(en)3]
– 2– – –
3+ 3+ 3+ (1) CN < C2O4 < SCN < F
(3) [Co(NH3)6] , [Co(en)3] , [Co(H2O)6] – – 2– –
(2) SCN < F < C2O4 < CN
3+ 3+ 3+ – – – 2–
(4) [Co(en)3] , [Co(NH3)6] , [Co(H2O)6] (3) SCN < F < CN < C2O4
– – 2– –
CC0149 (4) F < SCN < C2O4 < CN
CC0260
NEET(UG) 2018
42. Urea reacts with water to form A which will
36. The type of isomerism shown by the complex decompose to form B. B when passed through
[CoCl2(en)2] is 2+
Cu (aq), deep blue colour solution C is formed.
(1) Geometrical isomerism What is the formula of C from the following ?
(2) Coordination isomerism (1) CuCO3·Cu(OH)2 (2) CuSO4
(3) Ionization isomerism
2+
(4) Linkage isomerism (3) [Cu(NH3)4] (4) Cu(OH)2
CC0151 CC0261

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NEET(UG) 2021 NEET (UG) 2022 (Overseas)
43. Ethylene diaminetetraacetate (EDTA) ion is: 47. The number of bridging carbonyl groups in
(1) Hexadentate ligand with four "O" and two
[Co2(CO)8] and [Mn2(CO)10], respectively are
"N" donor atoms
(1) 2 and 2
(2) Unidentate ligand
(2) 2 and 4
(3) Bidentate ligand with two "N" donor atoms
(3) 0 and 2
(4) Tridentate ligand with three "N" donor atoms
(4) 2 and 0
CC0262 CC0266
44. Match List-I with List-II
48. Which one of the following is the correct order
List-I List-II
of spin-only magnetic moment for the given
(a) [Fe(CN)6]3– (i) 5.92 BM
complexes?
(b) [Fe(H2O)6]3+ (ii) 0 BM
3– 2+ 3–
(c) [Fe(CN)6]4– (iii) 4.90 BM (1) [Fe(CN)6] > [Co(H2O6] > [MnCl6]

®
(d) [Fe(H2O)6]2+ (iv) 1.73 BM
3– 3– 2+
(2) [MnCl6] > [Fe(CN)6] > [Co(H2O)6]
Choose the correct answer from the options
given below 3–
(3) [MnCl6] > [Co(H2O)6]
2+
> [Fe(CN)6]
3–

(1) (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)

2+ 3– 3–
(2) (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i) (4) [Co(H2O)6] > [MnCl6] > [Fe(CN)6]

(3) (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)

CC0267
(4) (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
Re-NEET (UG) 2022
CC0263 49. Match List-I with List-II :
NEET (UG) 2022
List-I List-II
45. The IUPAC name of the complex -
(Complexes) (Types)
[Ag(H2O)2][Ag(CN)2] is: (a) [Co(NH3)5NO2]Cl2 (i) ionisation

(1) diaquasilver(II) dicyanidoargentate(II) and [Co(NH3)5ONO]Cl2 isomerism

(2) dicyanidosilver(I) diaquaargentate(I) (b) [Cr(NH3)6] [Co(CN)6] (ii) coordination

(3) diaquasilver(I) dicyanidoargentate(I)
and [Cr(CN)6] [Co(NH3)6] isomerism
(4) dicyanidosilver(II) diaquaargentate(II)
(c) [Co(NH3)5(SO4)]Br (iii) linkage
CC0264
46. The order of energy absorbed which is and [Co(NH3)5Br]SO4 isomerism

responsible for the color of complexes (d) [Cr(H2O)6]Cl3 and (iv) solvate
2+
(A) [Ni(H2O)2(en)2]
[Cr(H2O)5Cl]Cl2.H2O isomerism
2+
(B) [Ni(H2O)4(en)] and
2+
Choose the correct answer from the options
(C) [Ni(en)3]
given below :
(1) (C)>(B)>(A) (2) (C)>(A)>(B)
(1) (a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
(3) (B)>(A)>(C) (4) (A)>(B)>(C) (2) (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
(3) (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
CC0265
(4) (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
CC0268

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50. Given below are two statements : one is labelled
as Assertion (A) and the other is labelled as
Reason (R).
Assertion (A) :
The metal carbon bond in metal carbonyls
possesses both σ and π character.
Reason (R) :
The ligand to metal bond is a π bond and metal
to ligand bond is a σ bond.
In the light of the above statements, choose the
most appropriate answer from the options given
below :
(1) Both (A) and (R) are correct and (R) is the
correct explanation of (A)
(2) Both (A) and (R) are correct but (R) is not
the correct explanation of (A)
(3) (A) is correct but (R) is not correct.

®
(4) (A) is not correct but (R) is correct.
CC0269

EXERCISE-II (Previous Year Questions) ANSWER KEY

Que. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Ans. 3 3 2 2 2 1 4 4 3 2 2 3 1 2 3
Que. 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Ans. 1 2 3 3 1 4 2 2 4 4 2 3 3 1 3
Que. 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
Ans. 4 4 1 2 4 1 2 2 2 4 2 3 1 4 3
Que. 46 47 48 49 50
Ans. 2 4 3 3 3

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EXERCISE-III (Analytical Questions) Master Your Understanding
1. A complex compound of cobalt has molecular 8. Which of the following is considered to be an
formula containing five NH3 molecules, one nitro anticancer species ?
group and two chlorine atom for one cobalt Cl
H3N Cl CH2
atom. One mole of this compound produces
three moles of ion in aqueous solution. On (1) Pt (2) Pt CH2
reaction with excess of AgNO3 solution two Cl NH3 Cl Cl
moles of AgCl get precipitated. The Ionic
formula of the compound is:- Cl Cl H3N Cl

(3) Pt (4) Pt
(1) [Co(NH3)4 NO2 Cl] NH3Cl
Cl Cl H3N Cl
(2) [Co(NH3)5Cl] ClNO2
(3) [Co(NH3)5NO2]Cl2 CC0169
(4) [Co(NH3)5(NO2)Cl] Cl 9. Which of the following does not have a metal-carbon
CC0161 bond ?
2. Which of the following react with AgCl ? (1) Ni(CO)4 (2) Al(OC2H5)3

®
(1) KCN (2) NH4OH (3) C2H5MgBr (4) K[Pt(C2H4)Cl3]
(3) Na2S2O3 (4) All CC0170
10. The correct order for the wavelength of
CC0162
absorption in the visible region is :
3. Which one of the following shows maximum 4– 2+ 2+
paramagnetic character ? (1) [Ni(NO2)6] < [Ni(NH3)6] < [Ni(H2O)6]
3– 4– 4– 2+ 2+
(1) [Fe(CN)6] (2) [Fe(CN)6] (2) [Ni(NO2)6] < [Ni(H2O)6] < [Ni(NH3)6]
3+ 2+ 2+ 2+ 4–
(3) [Cr(H2O)6] (4) [Cu(H2O)6] (3) [Ni(H2O)6] < [Ni(NH3)6] < [Ni(NO2)6]
CC0163 2+ 2+
(4) [Ni(NH3)6] < [Ni(H2O)6] < [Ni(NO2)6]
4–

4. Which statement is incorrect :- CC0172

(1) Ni(CO)4 - Tetrahedral, paramagnetic
–2
(2) [Ni(CN)4] - Square planar, diamagnetic 11. The IUPAC name of the coordination compound
(3) Ni(CO)4 - Tetrahedral, diamagnetic K3 [Fe(CN)6] is
–2 (1) potassium hexacyanoferrate (II)
(4) [NiCl4] - Tetrahedral, paramagnetic
(2) potassium hexacyanoferrate (III)
CC0164
(3) potassium hexacyanoiron (II)
5. Considering H2O as a weak field ligand, the (4) tripotassium hexacyanoiron (II)
2+
number of unpaired electrons in [Mn(H2O)6]
CC0173
will be (At. no. of Mn = 25) :-
(1) Four (2) Three (3) Five (4) Two 12. Which one of the following complexes would
CC0166 exhibit the lowest value of spin magnetic moment ?
6. Which of the following coordination compounds (1) [Cr(CN)6 ]
3–
(2) [Mn(CN)6 ]
3–

would exhibit optical isomerism ? 3– 3–

(1) tris-(ethylenediamine) cobalt (III) bromide (3) [Fe(CN)6] (4) [Co(CN)6 ]
(2) pentaamminenitrocobalt (III) iodide CC0174
(3) diamminedichloroplatinum (II) 13. A square planar complex is formed by
(4) trans-dicyanobis (ethylenediamine) chromium (III) hybridization of which atomic orbitals
chloride
(1) s, px, py, dyz (2) s, px, py, dx2 – y2
CC0167
(3) s, px, py, dz2 (4) s, px, py, dxy
2– 2–
7. Among [Ni(CO)4], [Ni(CN)4] , [NiCl4] species, CC0176
the hybridization states at the Ni atom are,
respectively (At. no. of Ni = 28):- 14. The most stable complex among the following is
2 3 3 3 2 2
(1) dsp , sp , sp (2) sp , dsp , dsp
(1) K3 [Al(C2O4)3] (2) [Pt(en)2]Cl2
3 2 3 3 3 2
(3) sp , dsp , sp (4) sp , sp , dsp
(3) [Ag(NH3)2]Cl (4) K2[Ni(EDTA)]
CC0168
CC0177

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15. Nickel (Z=28) combines with a uninegative 22. Which of the following has a square planar geometry
– 2– 2–
monodentate ligand X to form a paramagnetic (1) [PtCl4] (2) [CoCl4]
2–
complex [NiX4] . The number of unpaired (3) [FeCl4]
2–
(4) [NiCl4]
2–

electron (s) in the nickel and geometry of this CC0186

complex ion are, respectively. +3
23. Hybridisation of Cr in [Cr(NH3)6] is
(1) one, square planar (2) two, square planar
2 3 2 3 3 2
(3) one, tetrahedral (4) two, tetrahedral (1) dsp (2) dsp (3) d sp (4) sp d
CC0179 CC0187
16. In Fe (CO)5 , the Fe–C bond possesses 24. Hybridisation and shape of central metal atom of
(1) ionic character (2) σ – character only Wilkinson's catalyst is :-
2
(3) π –character only (4) both σ &π character (1) dsp , Square planar
CC0180 3
(2) sp , Tetrahedral
17. How many EDTA (ethylenediaminetetraacetic 3
(3) sp d, Trigonal bipyramidal
acid) molecules are required to make an 3 2
2+ (4) sp d , Octahedral

®
octahedral complex with a Ca ion ?
CC0188
(1) One (2) Two (3) Six (4) Three
CC0181 25. Which of the following is not an organo metallic
18. The "spin-only" magnetic moment [in units of compound :-
2+
Bohr magneton, (µB)] of Ni in aqueous solution (1) (C2H5)2Zn (2) CH3B(OCH3)2
would be (At. No. Ni= 28) (3) B(OCH3)3 (4) Ni(CO)4
(1) 0 (2) 1.73 (3) 2.84 (4) 4.90 CC0189
CC0182 26. Among the ligands NH3,en, CN and CO the
–

+2
19. The coordination number of Ni is = 4 correct order of their increasing field strength, is:-
–
NiCl2 + KCN (Complex) → A (Complex) (1) CO < NH3 < en < CN
–
A + Conc.HCl (Maximum) → B(Chloro complex) (2) NH3 < en < CN < CO
–
The IUPAC name of A and B are (3) CN < NH3 < CO < en
–
(1) potassium tetracyanonickelate(II), potassium (4) en < CN < NH3 < CO
tetrachloronickelate(II), CC0191
(2) tetracyanopotassiumnickelate(II), tetrachloro 27. Which one of the following complex ions has
potassiumnickelate (II), geometrical isomers ?
(3) tetracyanonickel (II), tetrachloronickel (II) 3+ +
(1) [Co (en)3] (2) [Ni (NH3)5Br]
(4) potassiumtetracyanonickel (II), 3+ 3+
potassiumtetrachloronickel (II). (3) [Co (NH3)2 (en)2] (4) [Cr (NH3)4(en)]
CC0183 CC0192
20. Which one of the following is tridentate ligand 28. Which among the following will be named as
(1) NO −
(2) oxalate ion dibromidobis (ethylene diamine) chromium (III)
2
bromide ?
(3) glycinate ion (4) dien
CC0184 (1) [Cr(en)Br2]Br (2) [Cr(en)3]Br3
–
21.
3+ 4+
Both Co and Pt have a coordination number (3) [Cr(en)2Br2]Br (4) [Cr(en)Br4]
of six. Which of the following pairs of complexes CC0193
3+
will show approximately the same electrical 29. The octahedral complex of a metal ion M with
conductance for their aqueous solutions four monodentate ligands L1, L2, L3 and L4
(1) CoCl3.4NH3 and PtCl4.4NH3 absorb wavelength in the region of red, green,
yellow and blue, respectively. The increasing
(2) CoCl3.3NH3 and PtCl4.5NH3 order of ligand strength of the four ligands is :
(3) CoCl3.6NH3 and PtCl4.5NH3 (1) L3 < L2 < L4 < L1 (2) L1 < L2 < L4 < L3
(4) CoCl3. 6NH3 and PtCl4.3NH3 (3) L4 < L3 < L2 < L1 (4) L1 < L3 < L2 < L4
CC0185 CC0194

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Pre-Medical
30. Which of the following statements is(are) correct? 35. Choose the correct statement
+
(1) [Ag(NH3)2] is linear with sp hybridised Ag ion.
+ (1) The Complex ion does have plane of
2– symmetry is always optically active.
(2) NiCl4 has tetrahedral geometry.
(2) In a coordination entity of the type
2+ 2+ 2–
(3) [Cu(NH3)4] , [Pt(NH3)4] and [Ni(CN)4] have +2
[PtCl2(en)2] , only cis isomer shows optical
2
dsp hybridisation of the metal ions. activity
–3
(4) All the above (3) Cis-(CrCl2(OX)2] is optically inactive whereas
–3
CC0195 trans [CrCl2(OX)2] is optically active.
31. Which of the following statements is not true (4) Optical isomerism is shown by square planar
2+ complexes.
about the complex ion [Pt(en)2Cl2] ?
CC0250
(1) It has two geometrical isomers – cis and trans
36. Choose the correct set representing the given
(2) Both the cis and trans isomers display optical
statements as true (T) or false (F).
activity. (I) Coordination isomerism arises from the
(3) Only the cis isomer displays optical acitivity.

®
interchange of ligands between cationic and
(4) Only the cis isomer has non-superimposable anionic entities present in a complex.
mirror image. (II) Thiocyanate ligand is an ambidentate ligand.
CC0196 (III) Ionisation isomerism arises when the counter
+ ion in a complex salt is itself a potential ligand
32. [Pt(NH3)(NH2OH)(NO2)(py)] will form how many
and can displace a ligand which can then
optical isomers ? becomes the counter ion.
(1) Zero (2) 3 (3) 4 (4) 5
(IV) [Co(NH3)6][Co(CN)6] do not exhibit coordination
CC0198 isomerism
33.
6 0
All the metal ions contains t2g eg configurations. (1) FTTT (2) TTTT
(3) TTTF (4) FTFT
Which of the following complex will be CC0252
paramagnetic ? 37. Select the incorrect statement
(1) [FeCl(CN)4(O2)]
4–
(2) K4[Fe(CN)6] (1) Coordination number and oxidsation state of
–5
a metal means the same thing in a complex.
(3) [Co(NH3)6]Cl3 (4) [Fe(CN)5(O2)] +3
(2) [Co(NH3)6] , is a diamagnetic octahedral
CC0200 complex and an inner orbital complex.
–3
34. Read the following statements : (3) [CoF6] is called an outer orbital complex as it
uses 4d orbitals in hydridisation.
(I) Geometrical isomerism is not observed in –2
(4) [NiCl4] & [Ni(CO)4] both complexes are
square planer complexes whereas optical tetrahedral.
isomerism may be observed. CC0253
(II) Square planar complexes of the type Ma2b2 38. Identify the incorrect one
(1) The magnetic behaviour of metal ions having
exhibit optical isomerism and two upto three electrons in the d orbitals in their
geometrical isomers. coordination entities is independent on the
(III) Square planar complex of the type Mabcd, nature of ligand.
4 5 6 7
shows three isomers - two cis and one trans. (2) Complex ions having d , d , d & d
configuration with presence of SFL are low
(IV) In fac-Co[(NH3)3(NO2)3] the three identical spin complexes.
ligands are present on the triangular face of (3) Magnetic moment of coordination compounds
the octahedral. is independent on nature of ligands.
–3
The option having incorrect statements is : (4) [Mn(CN)6] has magnetic moment of two
–3
(1) I, III & IV (2) I & II unpaired electrons whereas [MnCl6] has four
(3) II only (4) I, II, III & IV unpaired electrons.
CC0249 CC0254

149 149
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+3
39. Among the following statements the incorrect one 41. If the complex ion [Co(NH3)5(H2O)] absorbs
(1) The crystal field theory is an electrostatic blue-green radiation; then the colour of the
model which considers the metal ligand bond +2
radiation absorbed by [Co(NH3)5(Cl)] will be :-
to be ionic.
(1) Blue (2) Yellow
(2) The five d-orbitals of an isolated gaseous
metal atom/ion have same energy. (3) Violet (4) Indigo
(3) The degeneracy of d-orbitals is lost if a CC0257
spherically symmetrical field of negative 42. Pick the set correctly representing the given
charges surrounds the metal atom/ion. statements as true (T) or false (F).
(4) The pattern of splitting of d-orditals depends
(I) On heating the violet colour of [Ti(H2O)6]Cl3 is
upon the nature of the crystal field.
disappeared.
CC0255
(II) Red colour of ruby is due to incorporation of
40. Incorrect statement among the following is :
octahedral chromium (III) complexes into the
(1) If ∆0 < P the fourth electron enters one of eg
alumina lattice.

®
3 1
orbitals giving the configuration t2g eg . +3
(III) In emerald, Co ions occupy octahedral sites
(2) If ∆0 > P the fourth electron enters one of t2g in the mineral beryl (Be3 Al2 Si6 O18)
4 0
orbitals giving the configuration t e . +2
2g g (IV) On substitution of water in [Ni(H2O)6] by
– 6
(3) If ∆0 > P then e configuration of metal ion d ethylenediammine (en) then spin magnetic
will be represented as t e .4 2
2g g
moment is decreased.
(4) All of the above (1) TTFF (2) FTTF (3) TTTF (4) TFTT
CC0256 CC0259

EXERCISE-III (Analytical Questions) ANSWER KEY

Que. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Ans. 3 4 3 1 3 1 3 4 2 1 2 4 2 4 4
Que. 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Ans. 4 1 3 1 4 3 1 3 1 3 2 3 3 4 4
Que. 31 32 33 34 35 36 37 38 39 40 41 42
Ans. 2 1 1 2 2 3 1 3 3 3 2 1

150
 Co-ordination Chemistry 907
have flexidentate character if they do not use all its donar
atoms to get coordinated to the metal ion e.g., EDTA
generally act as a hexadentate ligand but it can also act as a
pentadentate and tetradentate ligand.
 Octahedral complex of the type [M(ABCDEF)] have 15
different geometrical isomers with a pair of enantiomers.
 Badecker reaction : This reaction involves the Although a few geometrical isomer have been prepared but
following chemical change. none has been resolved e.g., [Pt (Py)(NH3)(NO2)(Cl)(Br)I].
Na 2 [Fe(CN )5 NO ]  Na 2 SO 3  Na 4 [Fe(CN )5 (NO. SO 3 )]

 Everitt's salt : It is K 2 [Fe(CN )6 ] obtained by

reduction of prussian blue.
 Masking : Masking is the process in which a substance
without physical separation of it is so transformed that is
does not enter into a particular reaction e.g., masking of
Cu 2  by CN  ion. Basic Terms
 Macrocyclic effect : This term refers to the greater
thermodynamic stability of a complex with a cyclic 1. In K 4 FeCN 6
polydentate ligand when compared to the complex formed (a) (CN) are linked with primary valency
with a non-cyclic ligand. e.g., Zn (II) complex with ligand;
(b) (CN) are linked with secondary valency
(c) K are linked with secondary valency
NH NH NH NH
is more stable (d) K are linked with non-ionic valency
NH NH than with NH H2 2. The co-ordination number of copper in cuprammonium
2 N sulphate is [KCET 1991, 92]
(a) 2 (b) 6
 Prussian blue and Turnbull's blue is pot. ferric (c) 4 (d) – 4
ferrocyanide. However colour of Turnbull's blue is less 3. Which of the following acts as a bidentate ligand in
intense than prussian blue. Decrease in colour is due to the complex formation
presence in it of a white compound of the formula (a) Acetate (b) Oxalate
K 2 {Fe[Fe(CN )6 ]} named as potassium ferrous ferrocyanide. (c) Thiocyanate (d) EDTA
4. The co-ordination number of cobalt in the complex
 Crystal field theory explains why certain geometries are [Co (en)2 Br2 ]Cl 2 is
more favoured than other by certain metals in terms of (a) 2 (b) 6
crystal field stablization energies.
(c) 5 (d) 4
 The colour of complexes are explained in terms of 5. Which of the following ligands forms a chelate
electronic transitions between the various d orbitals of [MP PET/PMT 1998]
different energies. (a) Acetate (b) Oxalate
(c) Cyanide (d) Ammonia
 In octahedral complexes, the energy of the d z 2 and
6. According to Werner's theory
d x 2  y 2 orbitals increases much more than the energy of the [MP PMT 2000, 02]
(a) Primary valency can be ionized
d xy , d yz , d xz orbitals. The potential energy increases as a result
(b) Secondary valency can be ionized
of repulsive interactions. The greater the repulsion, greater is (c) Primary and secondary valencies both cannot be
the increases in energy. ionized
(d) Only primary valency cannot be ionized
 Ligands with larger groups from unstable rings than the
ligands with smaller groups. This is ascribable to steric 7. Which of the following is not true for ligand-metal
complex
hinderance produced by a larger group.
[MP PET 1993]
 When Ca2+ or Mg2+ forms complexes with EDTA, the pH (a) Larger the ligand, the more stable is the metal-ligand
of the solution decreases. bond
(b) Highly charged ligand forms strong bond
 The copper sulphate solution e.g., turns deep blue when
(c) Larger the permanent dipole moment of ligand, the
excess of ammonia is added. This is also due to the formation
more stable is the bond
of [Cu(NH3)4]SO4
(d) Greater the ionization potential of central metal, the
 Co-ordination compound with a general formula MA4, stronger is the bond
MA3B or MABCD do not show any geometric isomerism. 8. What is the co-ordination number of the metal in
 Flexidentate character : polydentate ligand are said to Co (en)2 Cl 2 
 908 Co-ordination Chemistry
(a) 4 (b) 5 20. Which one of the following forms with an excess of CN 
(c) 6 (d) 3 (Cyanide) a complex having coordination number two
9. Bidentate ligand is [AIIMS 2004]
  
(a) CN (b) Ethylene diammine (en) (a) Cu (b) Ag

(c) SCN (d) EDTA (c) Ni2
(d) Fe2 
10. The coordination number of Pt in PtNH 3 4 Cl 2  
ion 21. According to Lewis the ligands are [MP PMT 2002]
is (a) Acidic in nature
[MP PET 1995] (b) Basic in nature
(a) 2 (b) 4 (c) Neither acidic nor basic
(c) 6 (d) 8 (d) Some are acidic and others are basic
11. Which is the example of hexadentate ligand 22. The coordination number of a central metal atom in a
(a) 2, 2—dipyridyl complex is determined by [AIEEE 2004]
(b) Dimethyl glyoxime (a) The number of ligands around a metal ion bonded by
(c) Aminodiacetate ion sigma and pi-bonds both.
(d) Ethylene diammine tetra acetate ion [EDTA] (b) The number around a metal ion bonded by pi-bonds
12. The coordination number of a metal in coordination (c) The number of ligands around a metal ion bonded by
compounds is [MP PET 1996; KCET (Engg./Med.) 1999] sigma bonds
(a) Same as primary valency (d) The number of only anionic ligands bonded to the
(b) Sum of primary and secondary valencies metal ion
(c) Same as secondary valency 23. In the extraction of which of the following, complex ion
(d) None of these forms [MP PET 1989]
13. Ligand in a complex salt are [KCET 1992] (a) Cu (b) Ag
(a) Anions linked by coordinate bonds to a central metal (c) Fe (d) Na
atom or ion 24. Potassium ferrocyanide is a [AFMC 2000]
(b) Cations linked by coordinate bonds to a central metal (a) Normal salt (b) Mixed salt
atom or ion (c) Double salt (d) Complex salt
(c) Molecules linked by coordinate bonds to a central 25. A monodentate ligand has
metal atom or ion
(a) One co-ordinate site
(d) Ions or molecules linked by coordinate bonds to a
(b) Two co-ordinate sites
central metal atom or ion
(c) Any number of co-ordinate sites
14. A group of atoms can function as a ligand only when
(d) No capacity to co-ordinate
[KCET 1989; DCE 1999; MP PMT 2000]
26. EDTA has coordination number [AFMC 2004]
(a) It is a small molecule
(a) 3 (b) 4
(b) It has an unshared electron pair
(c) 5 (d) 6
(c) It is a negatively charged ion
27. Among the properties (a) reducing (b) oxidising (c)
(d) It is a positively charged ion
15. Which of the following complexes show six coordination complexing, the set of properties shown by CN  ion
number [RPET 2000] towards metal species is [AIEEE 2004]
(a) c, a (b) b, c
(a) [Zn(CN )4 ]2  (b) [Cr(H 2 O)6 ]3 
(c) a, b (d) a, b, c
(c) [Cu (CN )4 ]2 (d) [ Ni(NH 3 )4 ]2 28. That ion or molecule which forms a complex compound
with transitional metal ion is called
16. The number of ions formed when cuprammonium
sulphate is dissolved in water is [KCET 1993] (a) Recipient (b) Ligand
(a) 1 (b) 2 (c) Coordinate ion (d) No special name
(c) 4 (d) Zero 29. Coordination number of Zn in ZnS (zinc blende) is
[Orissa JEE 2004]
17. The coordination number of Cu in complex
(a) 6 (b) 4
Cu H 2 O 4  
is [MP PET 1995]
(c) 8 (d) 12
(a) 4 (b) 3 30. Wilkinson's catalyst used as a homogeneous catalyst in
(c) 2 (d) 1 the hydrogenation of alkenes contains
18. The primary valence of the metal ion in the co-ordination (a) Iron (b) Aluminium
compound K 2 NiCN 4  is (c) Rhodium (d) Cobalt
(a) Four (b) Zero 31. Given the molecular formula of the hexa coordinated
(c) Two (d) Six complexes (A) CoCl 3 .6 NH 3 (B) CoCl 3 .5 NH 3 (C)
19. The metal which does not form a polynuclear carbonyl is CoCl 3 .4 NH 3 . If the number of co-ordinated NH 3
(a) Mn (b) Co molecules in A, B and C respectively are 6, 5 and 4, the
(c) Cr (d) Fe primary valency in (A), (B) and (C) are: [DCE 2003]
(a) 6, 5, 4 (b) 3, 2, 1
 Co-ordination Chemistry 909
(c) 0, 1, 2 (d) 3, 3, 3 (c) Ferrous cyanide (d) Ferriferrocyanide
32. Generally, a group of atoms can function as a ligand if 45. Tollen's reagent is [KCET 1990]

(a) They are positively charged ions

[MP PET 1996]
(a) AgNH 3 2  
(b) Ag 2 O
(b) They are free radicals (c) Cu OH 4 2 (d) Cu 2 O
(c) They are either neutral molecules or negatively
46. Finely divided iron combines with CO to give
charged ions
[UPSEAT 2002]
(d) None of these
(a) Fe(CO )5 (b) Fe2 (CO )9
33. The ligand in potassium ferricyanide is
(a) K  (b) CN  (c) Fe2 (CO )12 (d) Fe(CO )6
(c) Fe 3
(d) CN 6 47. In a complex, the highest possible coordination number is
(a) 6 (b) 12
34. Co-ordination number of aluminum is [MHCET 2004]
(c) 4 (d) 8
(a) 8 (b) 6
(c) 12 (d) 4 48. The number of neutral molecules or negative groups
attached to the central metal atom in a complex ion is
35. In K 4 FeCN 6 , Fe is in the form of called
(a) An atom (b) An ion (a) Atomic number (b) Effective atomic number
(c) Cationic complex (d) Anionic complex (c) Coordination number (d) Primary valency
36. Which of the following ligands is expected to bidentate 49. EDTA combines with cations to form
[CBSE PMT 1994] (a) Ion-exchange resins (b) Chelates
(a) Br (b) C 2 O 42  (c) Clathrates (d) Polymers
(c) CH 3 NH 2 (d) CH 3 C  N 50. An example of a double salt is [MP PET 2001]

37. In the compound lithium tetrahydroaluminate, the ligand (a) Bleaching powder (b) Hypo
is (c) K 4 [Fe(CN )6 ] (d) Potash alum
[AIIMS 1997] 51. In complex compounds, metal ligand bond is
(a) H  (b) H  (a) Coordinate bond (b) Hydrogen bond
(c) H (d) None of these (c) Ionic bond (d) Covalent bond
38. Which of the following is the odd one out [MP PET 1996]
52. Ammonia forms the complex ion [Cu (NH 3 )4 ]2 with
(a) Potassium ferrocyanide
copper ions in alkaline solutions but not in acidic
(b) Ferrous ammonium sulphate
solution. What is the reason for it [AIEEE 2003]
(c) Potassium ferricyanide
(a) In acidic solutions hydration protects copper ions
(d) Tetrammine copper (II) sulphate
(b) In acidic solutions protons coordinate with ammonia
39. The basic ligand is
molecules forming NH 4 ions and NH 3 molecules
(a) NH 3 (b) CN 
are not available
(c) F  (d) All (c) In alkaline solutions insoluble Cu (OH )2 is
40. The negative ligand is precipitated which is soluble in excess of any alkali
(a) Aqua (b) Sulphato (d) Copper hydroxide is an amphoteric substance
(c) Carboxyl (d) Nitro sodium 53. Zeigler—Natta catalyst is used for which type of reaction
41. Which has yellow colour (a) Hydrogenation (b) Polymerization
(a) Potassium cobaltinitrite
(c) Oxidation (d) Reduction
(b) Potassium hexanitro cobaltate (III)
54. Which of the following is not considered as an
(c) Fischer's salt organometallic compound. [AIIMS 2004]
(d) All the above (a) Cis-platia (b) Ferrocene
42. Ligands, in complex compounds [MP PMT 2003]
(c) Zeise's salt (d) Gringard reagent
(a) Accept e  -pair 55. Which one is organometallic compound [MP PMT 2004]
(b) Donate e  -pair (a) Lithium methoxide (b) Lithium dimethyl amide
(c) Neither accept e  -pair nor donate (c) Lithium acetate (d) Methyl lithium
(d) All of these happen 56. An aqueous solution of potash alum gives [UPSEAT 2004]
43. Which of the following is a common donor atom in (a) Two types of ions (b) Only one type of ion
ligands (c) Four types of ions (d) Three types of ions
[BHU 2001] 57. Carnallite in solution in H 2 O , shows the properties of
(a) Arsenic (b) Nitrogen
[DCE 2003]
(c) Oxygen (d) Both (b) and (c)
(a) K  , Mg2  , Cl  (b) K  , Cl  , SO 42  , Br
44. Trunbull's blue is a compound
[KCET 1993] (c) K  , Mg2  , CO 32  (d) K  , Mg2  , Cl  , Br
(a) Ferricyanide (b) Ferrous ferricyanide
 910 Co-ordination Chemistry
58. What is the co-ordination number of cobalt in (b) Diammino dichloro platinate (IV)
Co (NH 3 )3 Cl3 [MP PET 1994] (c) Bis (ammino) dichloro platinum (IV)
(a) 3 (b) 4 (d) Dichloro diammine platinum (II)
(c) 5 (d) 6 6. Correct formula of diammine silver (I) chloride is
59. The formula of alum is [Pb. CET 2002] (a) Ag(NH 3 )Cl (b) Ag(NH 2 )Cl
(a) K2 SO 4 . Al2 (SO 4 )3 .24 H 2O (c) Ag(NH 3 )2 Cl (d) Ag(NH 2 )2 Cl
(b) K4 [Fe(CN )6 ] 7. The formula of sodium nitroprusside is [AIIMS 1992]
(a) Na 4 FeCN 5 NOS  (b) Na 2 FeCN 5 NO 
(c) K2 SO 4 . Al2 (SO 4 )3 .6 H 2O
(c) NaFeFeCN 6  (d) Na 2 FeCN 6 NO 2 
(d) Na 2CO 3 .10 H 2O
8. The correct name of [Pt(NH 3 )4 Cl 2 ] [PtCl4 ] is
60. Number of ions present in K4 [Fe(CN )6 ] [Pb. CET 2000]
[MP PET 2003]
(a) 2 (b) 10
(a) Tetraammine dichloro platinum (iv) tetrachloro
(c) 3 (d) 5
platinate (ii)
61. CH 3 MgI is an organometallic compound due to (b) Dichloro tetra ammine platinium (iv) tetrachloro
[DCE 2002] platinate (ii)
(a) Mg  I bond (b) C  I bond (c) Tetrachloro platinum (ii) tetraammine platinate (iv)
(c) C  Mg bond (d) C  H bond (d) Tetrachloro platinum (ii) dichloro tetraammine
platinate (iv)
62. What is the EAN of nickel in Ni(CO )4 [BVP 2003]
9. Correct formula of potassium ferrocyanide is
(a) 34 (b) 35 [CBSE PMT 1988]
(c) 32 (d) 36 (a) K 4 FeCN 6  (b) K 2 FeCN 6 H 2 O
(c) K 3 FeCN 6  (d) None of these
Nomenclature, Oxidation state and EAN number
10. The IUPAC name of Co NH 3 3 (NO 2 )3  is
1. How many ions are produced in aqueous solution of (a) Trinitrotriammine cobalt (III)
[Co (H 2 O)6 ]Cl 2 [RPMT 2002] (b) Trinitrotriammine cobalt (II)
(a) 2 (b) 3 (c) Trinitrotriammine cobalt (III) ion
(c) 4 (d) 6 (d) Trinitritriammine cobaltate (III)
2. IUPAC name of Pt(NH 3 )3 (Br)(NO 2 )Cl Cl is 11. In K 4 FeCN 6 , the E.A.N. of Fe is [DCE 2000]

[CBSE PMT 1998] (a) 33 (b) 35

(a) Triamminechlorobromonitroplatinum (IV) chloride (c) 36 (d) 26
(b) Triamminebromonitrochloroplatinum (IV) chloride 12. Which of the following pairs is not correctly matched
[MP PET 1993]
(c) Triamminebromochloronitroplatinum (IV) chloride
(d) Triamminenitrochlorobromoplatinum (IV) chloride (a) Effective atomic number of Pt in PtCl6 2   84
3. Oxidation state of nitrogen is incorrectly given for
[UPSEAT 2000, 01]

(b) Absorption peak for Cr III (NH 3 )6 3
 21680cm 1

Compound Oxidation state (c) Crystal field stabilization energy of d 2 in weak ligand
field  ()0.8  0
(a) [Co (NH 3 )5 Cl]Cl 2 0
(b) NH 2 OH 1 (d) Example of weak ligand field for d 5 configuration

(c) (N 2 H 5 )2 SO 4 2

 Mn II F6 
4

13. The oxidation number of chromium in sodium tetrafluoro

(d) Mg3 N 2 3 oxochromate complex is
4. The formula of dichloro bis (urea) copper (II) is (a) II (b) IV
[CBSE PMT 1997] (c) VI (d) III
(a) Cu{O  C(NH 2 )2 }Cl 2  14. The IUPAC name of K 4 FeCN 6  is
(b) CuCl 2 {O  C(NH 2 )2 }2  [CBSE PMT 1990; MP PET 1992;

(c) Cu{O  C(NH 2 )2 }Cl Cl MP PMT 1995, 97; Kurukshetra CET 2002]
(a) Potassium hexacyanoferrate (II)
(d) CuCl 2 {O  C(NH 2 )2 H 2 } (b) Potassium ferrocyanide
5. The IUPAC name of the complex PtNH 3 2 Cl 2  is (c) Tetrapotassium hexacyanoferrate (II)
(a) Platinum (II) diammino dichloride (d) Tetrapotassium ferroushexacyanide (II)
 Co-ordination Chemistry 911
15. The IUPAC name of Ni(CO )4  is [RPET 1999] [MP PMT 1993; MP PET 1997]
(a) Potassium ferrocyanide (II)
(a) Tetra carbonyl nickel (II)
(b) Potassium hexaferrocyanate (III)
(b) Tetra carbonyl nickel (0)
(c) Potassium ferrohexacyanate (II)
(c) Tetra carbonyl nickelate (II) (d) Potassium hexacyanoferrate (III)
(d) Tetra carbonyl nickelate (0) 27. The EAN of iron in potassium ferricyanide is
16. The correct nomenclature for Fe4 [Fe(CN )6 ]3 is [Pb. CET 2000]
[MP PMT 1994] (a) 18 (b) 54
(a) Ferroso-ferric cyanide (c) 35 (d) 23
(b) Ferric-ferrous hexacyanate 28. In the coordination compound, K 4 [ Ni(CN )4 ] oxidation
(c) Iron (III) hexacyanoferrate (II) state of nickel is [AIEEE 2003]

(d) Hexacynoferrate (III-II) (a) 1 (b) 0

(c) 1 (d) 2
17. The IUPAC name of compound Na 3 Co (ONO)6  will be
29. According to IUPAC nomenclature sodium nitroprussied
[MP PMT 2000] is named is [CBSE PMT 2003]
(a) Hexanitritocobalt (III) sodium (a) Sodium pentacyanonitrosyl ferrate (III)
(b) Sodium cobalt nitrite (b) Sodium nitroferricyanide
(c) Sodium hexanitrocobaltate (III) (c) Sodium nitroferrocyanide
(d) Sodium hexanitritocobaltate (III) (d) Sodium pentacyanonitrosyl ferrate (II)
18. In which of the following complexes oxidation state of 30. Pick out the complex compound in which the central
metal is zero [MP PET 1997] metal atom obeys EAN rule strictly [KCET 2003]
(a) PtNH 3 2 Cl 2  (b) Cr CO 6  (a) K 4 [Fe(CN )6 ] (b) K 3 [Fe(CN )6 ]

(c) Cr NH 3 3 Cl 3  (d) Cr en 2 Cl 2  (c) [Cr(H 2 O)6 ]Cl 3 (d) [Cu(NH 3 )4 ] SO 4
31. Which of the following is wrong statement [BHU 2003]
19. The oxidation number of Cr in [Cr(NH 3 )6 ]Cl 3 is
(a) Ni(CO )4 has oxidation number + 4 for Ni
[CBSE PMT 2001]
(b) Ni(CO )4 has zero oxidation number for Ni
(a) 8 (b) 6
(c) Ni is metal
(c) 4 (d) 3
(d) CO is gas
20. In NiNH 3 4 SO 4 , the E.A.N. of Ni is 32. Oxidation state of Fe in K 3 [Fe(CN )6 ] [RPMT 2002]
(a) 34 (b) 35 (a) 2 (b) 3
(c) 36 (d) 37 (c) 0 (d) None of these
21. IUPAC name of [Co (ONO)(NH 3 )5 Cl 2 ] is 33. Which complexes have zero oxidation state
[AMU 2002] (a) Carbonyl (b) Ferrocyanide
(a) Pentaammine nitro cobalt (III) chloride (c) Amine (d) Cyanide
(b) Pentaammine nitrito cobalt (III) chloride 34. The proper name for K 2 [PtCl]6 is [MH CET 2002]

(c) Pentaammine nitroso cobalt (III) chloride (a) Potassium platinum hexachloride
(d) Pentaammine oxo-nitro cobalt (III) chloride (b) Potassium hexachloro platinum IV
(c) Potassium hexachloro platinate IV
22. The oxidation number of Pt in [Pt(C 2 H 4 )Cl 3 ] is
(d) Potassium hexachloro platinum
[MNR 1993] 35. IUPAC name of K 3 AlC 2 O 4 3  is called
(a) + 1 (b) + 2
[MP PMT 1993, 02, 03]
(c) + 3 (d) + 4 (a) Potassium alumino oxalato
23. The oxidation state of cobalt in the complex compound (b) Potassium aluminium (III) trioxalate
Co NH 3 6 Cl 3 is (c) Potassium trioxalato aluminate (III)
(a) + 3 (b) + 6 (d) Potassium trioxalato aluminate (IV)
(c) + 5 (d) + 2 36. The I.U.P.A.C. name of K 3 [Ir(C 2 O 4 )3 ] is
24. The correct IUPAC name of potassium cuprochloride is
[MP PMT 2001]
(a) Potassium copper (I) tetrachloride
(b) Potassium tetrachlorocuprate (I) (a) Potassium tri oxalato iridium (III)
(c) Tetrachloropotassium cuprate (I) (b) Potassium tri oxalato iridate (III)
(d) Tetrachlorocopper (I) potassiate (c) Potassium tris (oxalato) iridium (III)
25. The effective atomic number of cobalt in the complex (d) Potassium tris (oxalato) iridate (III)
[Co (NH 3 )6 ]3  is [MP PET 2003] 37. The charge on [ Ag(CN )2 ] complex is [AIIMS 2001]
(a) 36 (b) 33 (a) 1 (b) 1
(c) 24 (d) 30 (c) 2 (d) 3
26. IUPAC name of K 3 Fe(CN )6 is
 912 Co-ordination Chemistry
38. The IUPAC name of Co NH 3 6 Cl 3 is [IIT-JEE 1994] 49. What is the structural formula of lithium
tetrahydridoaluminate [MP PMT 2003]
(a) Hexammine cobalt (III) chloride
(a) Al[LiH 4 ] (b) Al2 [LiH 4 ]3
(b) Hexammine cobalt (II) chloride
(c) Triammine cobalt (III) trichloride (c) Li[ AlH4 ] (d) Li[AlH4 ]2
(d) None of these 50. IUPAC name for KAgCN 2  is
39. IUPAC name of Co NH 3 3 H 2 O 2 Cl  Cl 2 is
(a) Potassium argentocyanide
[MP PET 1994] (b) Potassium silver cyanide
(a) Diaquachlorodiammine cobalt (III) chloride (c) Potassium dicyanoargentate (I)
(b) Triamminediaquachloro cobalt (III) chloride (d) Potassium dicyanosilver (II)
The oxidation state of Co in Co H 2 O 5 Cl 2  is
(c) Chlorodiamminediaqua cobalt (III) chloride
51.
(d) Diamminediaquachloro cobalt (II) chloride
(a) + 2 (b) + 3
40. Dichloro diammine platinum (II) complex has the
formula (c) + 1 (d) + 4
[MP PMT 1997] 52. The chemical formula of diammine silver (I) chloride is
[BHU 2004]
(a) Pt[Cl 2 (NH 3 )2 ] (b) Pt[R.( NH 2 )2 ]Cl 2
(a) [ Ag(NH 3 )]Cl (b) [ Ag(NH 3 )2 ]Cl
(c) [PtCl2 (NH 3 )2 ] (d) [Pt.R.( NH 2 )2 ]Cl 2
(c) [ Ag(NH 3 )2 ]Cl (d) [ Ag(NH 4 )2 ]Cl
41. The formula of potassiumdicyano bis (oxalato) nickelate
(II) is 53. IUPAC name of [Co (NH 3 )5 NO 2 ]Cl2 [Pb. CET 2000]
(a) K 4 NiCN 2 (Ox )2  (b) K 3 Ni 2 [ Ni 2 (CN )2 (Ox )2  (a) Pentamminenitrocobalt (III) chloride
(b) Pentamminenitrosocobalt (III) chloride
(c) KNi(CN )(Ox )2  (d) K 2 Ni(CN )2 (Ox )2 
(c) Pentamminenitrocobalt (II) chloride
42. The value of x which appears in the complex NiCN 4 x is (d) None of these
(a) + 2 (b) – 2 54. The pair of the compounds in which both the metals are
in the highest possible oxidation state is
(c) 0 (d) 4
[IIT-JEE (Screening) 2004]
43. Pick the correct name of [Co (NH 3 )5 Cl]Cl 2 [AMU 2001] 3 3
(a) [Fe(CN )6 ] , [Co (CN )6 ]
(a) Chloropentammine cobalt (III)
(b) Pentammine cobalt (III) chloride (b) CrO2Cl 2 , MnO4
(c) Chloropentammine cobalt (III) chloride (c) TiO3 , MnO2
(d) Chloropentammine cobalt (II) chloride
(d) [Co (CN )6 ]3  , MnO3
44. The valency of cuprammonium ion is
(a) + 4 (b) + 2 55. The IUPAC name of [Cr(NH 3 )6 ]3  is [Pb. CET 2001]
(c) – 2 (d) – 4 (a) Hexamminechromium (VI) ion
45. In which of the following compounds transition metal has (b) Hexamminechromium (III) ion
zero oxidation state [CBSE PMT 1999] (c) Hexamminechromium (II) ion
(a) CrO5 (b) NH 2 .NH 2 (d) Hexamminechloride
(c) NOClO 4 (d) FeCO 5  56. The IUPAC name of K2 [Cr(CN )2 O2 (O)2 (NH 3 )] is

46. The complex chlorocompound diaquatriammine cobalt (III) [DCE 2003]

chloride is represented as [CBSE PMT 2002] (a) Potassium ammine dicyano dioxoperoxochromate
(a) [Co (NH 3 )3 (H 2 O)3 ]Cl 2 (VI)
(b) Potassium ammine cyano peroxo dioxo chromium
(b) [Co (NH 2 )3 (H 2 O)2 ]Cl 2 (VI)
(c) [CoCl (NH 3 )3 (H 2 O)2 ]Cl 3 (c) Potassium ammine cyano peroxo dioxo chromiun
(VI)
(d) [CoCl (NH 3 )3 (H 2 O)2 ]Cl 2
(d) Potassium ammine cyano peroxo dioxo chromatic
47. The complex compound Co NH 3 3 NO 2 ClCN  is named (IV)
as [MP PMT 1996] 57. The IUPAC name of the coordination compound
(a) Chlorocyanonitrotriammine cobalt (III) K3 [Fe(CN )6 ] is [AIEEE 2005]
(b) Nitrochlorocyanotriammine cobalt (III) (a) Potassium hexacyanoferrate (II)
(c) Cyanonitrochlorotriammine cobalt (III) (b) Potassium hexacyanoferrate (III)
(d) Triamminenitrochlorocyano cobalt (III) (c) Potassium hexacyanoiron (II)
48. The oxidation number of Pt in [Pt(C 2 H 4 )Cl 3 ] is (d) Tripotassium hexacyanoiron (II)
[UPSEAT 1999, 01] 58. Which compound is zero valent metal complex [KCET 2005]
(a) 1 (b) 2 (a) [Cu(NH 3 )4 ]SO 4 (b) [Pt(NH 3 )2 Cl 2 ]
(c) 3 (d) 4
 Co-ordination Chemistry 913
(c) [ Ni(CO )4 ] (d) K 3 [Fe(CN )6 ] 12. Which of the following isomeric pairs shows ionization
isomerism [MP PET 1993]
(a) Co NH 3 6 Cr CN 6  and Cr(NH 3 )6 Co (CN )6 
Isomerism and magnetic properties (b) Cr H 2 O 6 Cl 3 and Cr H 2 O5 Cl Cl 2 .H 2 O
1. Which one of the following octahedral complexes will not
(c) PtNH 3 2 Cl 2  and Pt(NH 3 )4 PtCl4 
show geometric isomerism (A and B are monodentate (d) Co (NH 3 )5 BrSO 4 and Co NH 3 5 SO 4 Br
ligands) [CBSE PMT 2003]
13. Among the following ions which one has the highest
(a) [MA5 B] (b) [MA2 B4 ] paramagnetism [IIT 1993; UPSEAT 2002]
(c) [MA3 B3 ] (d) [MA4 B 2 ] (a) Cr(H 2 O)6 3  (b) Fe(H 2 O)6 2 

(c) Cu H 2 O 6 2  (d) ZnH 2 O 6 2 

2. The number of unpaired electrons in the complex ion
[CoF6 ]3  is (Atomic no. of Co  27) [CBSE PMT 2003]
(a) Zero (b) 2 14. Amongst NiCO 4 , Ni(CN )4 2  and [NiCl 4 ] 2  [IIT 1991]

(a) NiCO 4 and NiCl 4 2  are diamagnetic and

(c) 3 (d) 4
3. Which would exhibit co-ordination isomerism
[ Ni(CN )4 ] 2  is paramagnetic
(a) Cr(NH 3 )6 Co (CN )6  (b) Co (en)2 Cl 2 

(c) Cr NH 3 6 Cl 3 (d) Cr(en)2 Cl 2  (b) NiCl4 2 and NiCN 4 2 are diamagnetic and
NiCO 4 is paramagnetic
4. Co NH 3 5 NO 2 Cl 2 and Co NH 3 5 ONO Cl 2
are
related to each other as (c) NiCO 4 and NiCN 4 2  are diamagnetic and
(a) Geometrical isomers (b) Optical isomers
NiCl4 2 is paramagnetic
(c) Linkage isomers (d) Coordination isomers
5. Co (NH 3 )5 Br SO 4 and Co (NH 3 )5 SO 4 Br are (d) NiCO 4 is diamagnetic and NiCl 4 2  and
examples of which type of isomerism NiCN 4 2 are paramagnetic
[MP PMT 1993, 94, 95; MP PET 1997; MP PET/PMT 1998]
(a) Linkage (b) Geometrical 15. Co NH 3 4 Cl 2  exhibits
(c) Ionization (d) Optical (a) Geometrical isomerism (b) Optical isomerism
6. Co NH 3 4 Cl 2 NO 2 and Co NH 3 4 Cl. NO 2 Cl are ........ (c) Bonding isomerism (d) Ionisation isomerism
isomers [MP PMT 1993; MP PET 1995, 2001] 16. The compound which does not show paramagnetism is
(a) Geometrical (b) Optical [IIT 1992]
(c) Linkage (d) Ionization (a) Cu NH 3 4 Cl 2
(b) AgNH 3 2 Cl
7. Which would exhibit ionisation isomerism [MP PET 1997]
(a) Cr NH 3 6 Cl 3 (b) Co NH 3 5 BrSO 4
(c) NO (d) NO 2
The number of geometrical isomers for Pt(NH 3 )2 Cl 2  is
(c) Cr(en)2 Cl 2  (d) Cr(en)3 Cl 3  17.
[CBSE PMT 1995]
8. [Ti(H 2 O)6 ]3 is paramagnetic in nature due to [RPMT 2002]
(a) Two (b) One
(a) One unpaired e  (b) Two unpaired e  (c) Three (d) Four
(c) Three unpaired e 
(d) No unpaired e  18. The pair of complex compounds Cr H 2 O 6 Cl 3  and
9. Coordination isomerism is caused by the interchange of Cr H 2 O 5 Cl Cl 2 H 2 O are an example of [MP PMT 1997]
ligands between the [UPSEAT 2002]
(a) Linkage isomerism (b) Ionisation isomerism
(a) Cis and Trans structure (c) Coordination isomerism (d) Hydrate isomerism
(b) Complex cation and complex anion 19. The number of geometrical isomers of the complex
(c) Inner sphere and outer sphere Co (NO 2 )2 (NH 3 )2  is [CBSE PMT 1997]
(d) Low oxidation and higher oxidation states
(a) 2 (b) 3
10. Which one of the following will not show geometrical
isomerism [MP PMT 2002]
(c) 4 (d) 0
20. The type of isomerism present in nitropentamine
(a) [Cr(NH 3 )4 Cl 2 ]Cl (b) [Co (en)2 Cl 2 ]Cl
chromium (III) chloride is [AIEEE 2002]
(c) [Co (NH 3 )5 NO 2 ]Cl 2 (d) [Pt(NH 3 )2 Cl 2 ] (a) Optical (b) Linkage
11. Paramagnetic co-ordination compounds contain ........ (c) Ionization (d) Polymerisation
electrons 21. Which of the following compounds exhibits linkage
(a) No isomerism [MP PMT 2001]
(b) Both paired and unpaired (a) [Co (en)3 ]Cl 3 (b) [Co (NH 3 )6 [Cr(CN )6 ]
(c) Paired (c) [Co (en)2 NO 2 Cl]Br (d) [Co (NH 3 )5 Cl]Br2
(d) Unpaired
 914 Co-ordination Chemistry
22. Pick out from the following complex compounds, a poor (c) 4 (d) 6
electrolytic conductor in solution [MP PMT 1994] 34. The number of unpaired electrons in Ni(CO )4 is
(a) K 2 PtCl6  (b) Co NH 3 3 (NO 2 )3 
[AIIMS 1997]
(c) K 4 FeCN 6  (d) Cu NH 3 4 SO 4 (a) Zero (b) One
23. The possible number of optical isomers in [Co (en )2 Cl 2 ]  (c) Three (d) Five
are [MP PET 2003] 35. If the magnetic moment of AgCN 2 1 is zero, then the
(a) 2 (b) 3 number of unpaired electrons will be [MP PET 1995]
(c) 4 (d) 6 (a) 1 (b) 2
24. Magnetic moment of [Cu (NH 3 )4 ]2 ion is [RPET 2003] (c) 3 (d) Zero
(a) 1.414 (b) 1.73 36. PtNH 3 4 Cl 2 Br2 and Pt(NH 3 )4 Br2 Cl 2 are related to
(c) 2.23 (d) 2.38 each other as
[MP PET 1996; AFMC 2000; CBSE PMT 2001]
25. What is true for [Fe(CN )6 ]3  and [FeF6 ]3  [RPET 1999]
(a) Optical isomers (b) Coordinate isomers
(a) Both are paramagnetic
(c) Ionization isomers (d) Linkage isomers
(b) Only [Fe(CN )6 ]3  is paramagnetic 37. Which of the following complex will show geometrical as
well as optical isomerism (en = ethylene diamine)
(c) Only [FeF6 ]3  is paramagnetic
[KCET 1996]
(d) Both are diamagnetic
(a) PtNH 3 2 Cl 2 (b) PtNH 3  Cl 4 
26. Which of the following is paramagnetic [AFMC 1997]
(a) NiCO 4  (b) [Co (NH 3 )6 ]3  (c) Pten 3 4  (d) Pten 2 Cl 2
38. Which of the following complexes is diamagnetic
(c) NiCN 4 2 (d) NiCl4 2 [RPMT 1997]
27. The total number of possible isomers for the complex 2
 
compound Cu II (NH 3 )4 Pt II Cl 4 are  (a) Ni(CO )4 (b) Ni(Cl 4 )

[CBSE PMT 1998; DPMT 2004; J & K CET 2005] (c) Ni(Br)42  (d) NiCl 2 .4 H 2 O
(a) 3 (b) 4 39. Which one has the highest paramagnetism [AMU 2001]
(c) 5 (d) 6 (a) Ni(CO )4 (b) [ Ni(NH 3 )4 ]Cl 2
28. Which one of the following shows maximum
paramagnetic character [AIIMS 1998]
(c) [ Ni(NH 3 )6 ]Cl 2 (d) [Cu(NH 3 )4 ]Cl 2

(a) Cr H 2 O 6 3  (b) Fe(CN )6 4  40. Which of the following coordiantion compounds would
exhibit optical isomerism [CBSE PMT 2004]
(c) Fe(CN )6 3  (d) Cu(H 2 O)6 2 (a) trans-dicyanobis (ethylenediamine) chromium (III)
chloride
29. The complexes [Co (NH 3 )6 ][Cr(C 2 O4 )3 ] and
(b) tris-(ethylenediamine) cobalt (III) bromide
[Cr(NH 3 )6 ] [Co (C 2 O4 )3 ] [AMU 2002]
(c) pentaamminenitrocobalt (III) iodide
(a) Linkage isomerism (b) Geometrical isomerism (d) diamminedichloroplatinum (II)
(c) Coordination isomerism (d) Ionisation isomerism 41. Which of the following does not have optical isomer
30. Which of the following exhibits highest molar [AIIMS 2004]
conductivity (a) [Co (NH 3 )3 Cl3 ]
[MP PET 1994]
(b) [Co (en)3 ]Cl3
(a) Co NH 3 6 Cl 3 (b) Co NH 3 5 Cl Cl 2
(c) [Co (en)2 Cl2 ]Cl (d) [Co (en)(NH 3 )2 Cl2 ]Cl
(c) Co NH 3 4 Cl 2 Cl (d) Co NH 3 3 Cl 3  42. Change in composition of co-ordination sphere yields
31. Which of the following compounds is colourless which types of isomers [DCE 2002]
[MP PET 1994] (a) Optical (b) Geometrical
(a) Cu 2 (CH 3 COO)4 .2 H 2O (b) Cu 2Cl 2 (c) Ionisation (d) None of these
43. Types of isomerism shown by [
(c) CuSO 4 .5 H 2O (d) [Cu(NH 3 )4 ]SO 4 .4 H 2O [Cr(NH 3 )5 NO 2 ]Cl2 is
32. The type of magnetism exhibited by MnH 2 O 6 2  ion is (a) Optical (b) Ionisation
(c) Geometrical (d) Linkage
[IIT 1994]
44. Which of the following will not give a precipitate with
(a) Paramagnetism (b) Diamagnetism AgNO 3 [MP PET 2003]
(c) Both (a) and (b) (d) None of these
33. The number of isomers possible for square planar
(a) Co (NH 3 )3 Cl 3  (b) Co NH 3 4 Cl 2 Cl
complex K 2 PdClBr2 (SCN ) is [MP PET 1994] (c) Co (NH 3 )5 Cl Cl 2 (d) Co NH 3 6 Cl 3
(a) 2 (b) 3
 Co-ordination Chemistry 915
45. How many ions are produced from [Co NH 3 6 ]Cl3 in (b) Show optical Isomerism
solution [RPET 1999] (c) Show ionic Isomerism
(a) 6 (b) 4 (d) A octahedral complex
(c) 3 (d) 2 (e) A cationic complex
46. The colour of CoCl 3 .5 NH 3 .H 2 O is [Kerala (Med.) 2002]
(a) Orange yellow (b) Orange Hybridisation and Geometry
(c) Green (d) Violet
(e) Pink 1. The correct structural formula of zeise's salt is
47. Which one of the following is expected to be a
paramagnetic complex [MP PMT 1991, 2000] 
(a) K  PtCl3   2  (C 2 H 4 ) 


(a) NiH 2 O 6 2 (b) NiCO 4  (b) K 2 PtCl

3   2  C2 H 4 
(c) ZnNH 3 4 2 (d) Co NH 3 6 3 (c) K  PtCl
2 
  2  (C 2 H 4 ) Cl 
48. Which one of the following will give a white precipitate (d) K PtCl3 (C 2 H 4 
 

with AgNO3 in aqueous mediun [MP PMT 1994]

2. The correct order of hybridisations of central atom in
(a) Co NH 3 5 Cl NO2 2 (b) PtNH 3 2 Cl2  NH 3 ,[PtCl4 ]2 , PCl5 and BCl 3 is [MP PMT 2003]
(c) Pt(en)Cl2  (d) PtNH 3 4 Cl2 (a) dsp 2 , dsp3 , sp 2 and sp 3
49. How many ions will be produced in solution from one
molecule of chloropentammine cobalt (III) chloride (b) sp 3 , sp 3 , sp 3 d and sp 2
(a) 1 (b) 2 (c) dsp 2 , sp 2 , sp 3 and dsp 3
(c) 3 (d) 4
50. Which of the following complex will give white precipitate (d) dsp 2 , sp 3 , sp 2 and dsp 3
with BaCl 2 (aq.) [JIPMER 1997] 3. One mole of the complex compound Co (NH 3 )5 Cl 3 , gives
(a) [Co (NH 3 )4 SO 4 ]NO 2 (b) [Cr NH 3 5 SO 4 ]Cl 3 moles of ions on dissolution in water. One mole of the
same complex reacts with two moles of AgNO3 solution
(c) [Cr(NH 3 )5 Cl]SO 4 (d) Both (b) and (c)
to yield two moles of AgCl (s) . The structure of the
51. The number of precipitable halide ions in the sample
[PtNH 3 Cl 2 Br]Cl will be complex is
[AIEEE 2003]
(a) 2 (b) 3 (a) [Co (NH 3 )5 Cl] Cl 2
(c) 4 (d) 1
(b) [Co (NH 3 )3 Cl 3 ]. 2 NH 3
52. The colour of tetrammine copper (II) sulphate is
(a) Blue (b) Red (c) [Co (NH 3 )4 Cl 2 ] Cl . NH 3
(c) Violet (d) Green (d) [Co (NH 3 )4 Cl]Cl 2 . NH 3
53. The number of ions per mole of a complex
[CoCl 2 .5 NH 3 ]Cl 2 in aqueous solution will be 4. Cuprammonium ion Cu NH 3 4 2  is
[MP PMT 2001] [MP PMT 1997; KCET 2002]
(a) Nine (b) Four (a) Tetrahedral (b) Square planar
(c) Triangular bipyramid (d) Octahedral
(c) Three (d) Two
54. How many unpaired electrons are present in the central 5. In the complex [SbF5 ]2  , sp 3 d hydridisation is present.
metal ion of [CoCl 4 ]2  [Orissa JEE 2005] Geometry of the complex is [Pb. PMT 2000]
(a) Square pyramidal (b) Square bipyramidal
(a) 3 (b) 4
(c) Tetrahedral (d) Square
(c) 5 (d) 2
6. The type of hybridization involved in the metal ion of
55. What is the magnetic moment of K 3 [FeF6 ]
[ Ni(H 2 O)6 ] 2  complex is
[Orissa JEE 2005]
(a) 5.91 BM (b) 4.89 BM (a) d 3 sp 2 (b) sp 3 d 2
(c) 3.87 BM (d) 6.92 BM
(c) sp 3 (d) dsp 2
56. (i) K4 [Fe(CN )6 ] (ii) K3 [Cr(CN )6 ] (iii) K3 [Fe(CN )6 ]
7. In the formation of K 4 Fe(CN )6 , the hybridisation involved
(iv) K 2 [ Ni(CN )4
is
Choose the complex which is paramagnetic
(a) sp 2 (b) d 2 sp 3
[Kerala CET 2005]
(a) (i), (ii) and (iii) (b) (i), (iii)and (iv) (c) d 3 sp 2 (d) d 4 p
(c) (i), (iii) and (iv) (d) (i), (ii) and (iv) 8. Which of the following is not true for metal carbonyls
(e) (ii) and (iv) [MP PET 1993]
57. In coordination compound [Co (en)2 Cl 2 ]Cl which is false (a) The oxidation state of the metal in the carbonyls is
[Kerala CET 2005] zero
(a) Show geometrical Isomerism (b) The secondary carbonyls are obtained from photo-
decomposition
 916 Co-ordination Chemistry
(c) Metal carbonyls are single bonded species 21. A tetrahedral complex ion is formed due to ........
(d) d  p overlap is observed in metal carbonyls hybridization
9. An octahedral complex is formed, when hybrid orbitals of (a) sp 2 (b) sp 3
the following type are involved [DCE 2003]
(c) dsp 2 (d) d 2 sp 3
(a) sp 3
(b) dsp 2
22. Back bonding is involved in which of the organometallic
(c) sp d 3 2
(d) sp 2 d compounds
10. Which one is an example of octahedral complex (a) (CH 3 )3 Al2 
(b) Mg 2  C 5 H 5 2
[MP PET 2000] (c) R  Mg  X (d) (C 5 H 5 )2 Fe
(a) FeF63  (b) Zn(NH 3 )42
23. d sp hybridisation leads to
2 3

(c) Ni(CN )42  (d) Cu (NH 3 )42  (a) Hexagonal shape (b) Trigonal bipyrimidal
11. Which of the following complexes has a square planar (c) Octahedral shape (d) Tetrahedral shape
geometry 24. Chromium hexacarbonyl is an octahedral compound
(a) AgNH 3 2 (b) Cu en 22  involving
(a) sp 3 d 2 (b) dsp 2
(c) MnCl 4 2 (d) NiCO 4
(c) d 2 sp 3 (d) d 3 sp 2 orbitals
12. The shape of Fe(CN )6 4  ion is
25. CoF6 3 is formed by ..... hybridization
(a) Hexagonal (b) Pyrimidal
(c) Octahedral (d) Octagonal (a) d sp 2 3
(b) d 3 sp 2
13. What is the shape of Fe(CO )5 [CBSE PMT 2000] (c) d 2 sp 3 (d) sp 3 d 2
(a) Linear (b) Tetrahedral 26. The species havoing tetrahedral shape is
(c) Square planar (d) Trigonal bipyramidal [IIT-JEE (Screening) 2004]
14. What type of hybridization is involved in [Fe(CN )6 ]3  (a) [PdCl4 ] 2
(b) [ Ni(CN )4 ]2 
[AMU 1999]
(c) [Pd(CN )4 ]2  (d) [NiCl4 ]2 
(a) d 2 sp 3 (b) dsp 2
27. Among [ Ni(CO )4 ], [ Ni(CN )4 ]2  , [ NiCl4 ]2  species, the
(c) sp 3 d 2 (d) dsp 3
hybridization states at the Ni atom are, respectively
15. The example of dsp 2 hybridisation is [CBSE PMT 2004; MP PMT 1992; BHU 1995; AFMC 1997]
[MP PET 1999; AIIMS 2001] (a) sp3 , sp3 , dsp2 (d) dsp2 , sp3 , sp3
(a) Fe(CN )63  (b) NiCN 42  (c) sp3 , dsp2 , dsp2 (d) sp3 , dsp2 , sp3
(c) ZnNH 3 42  (d) FeF63  (At. no. of Ni = 28)
28. The bond in K4 [Fe(CN )6 ] are: [MP PET 2004]
16. The shape of Cu NH 3 4 2  is square planar, Cu 2  in this
(a) All ionic
complex is [NCERT 1989; RPET 1999] (b) All covalent
(a) sp 3 hybridised (b) dsp 2 hybridised (c) Ionic and covalent
(c) sp 3 d hybridised (d) sp 3 d 2 hybridised (d) Ionic, covalent and co-ordiante covalent
29. Hybridization of Fe in K3 Fe(CN )6 is [DCE 2002]
17. The geometry of NiCO 4 and NiPPh3 2 Cl 2 are
[IIT-JEE 1999; DCE 2002] (a) sp3 (b) dsp3
(a) Both square planar (c) sp3 d 2 (d) d 2 sp3
(b) Tetrahedral and square planar respectively 30. The complex ion which has no ‘d ’ electrons in the central
(c) Both tetrahedral metal atom is [IIT-JEE Screening 2001]
(d) Square planar and tetrahedral respectively
(a) [MnO4 ] (b) [Co (NH 3 )6 ]3 
18. Which complex has square planar structure [JIPMER 2002]
(a) Ni(CO )4 (b) [NiCl4 )2 (c) [Fe(CN )6 ]3  (d) [Cr(H 2 O)6 ]3 
31. Which of the following statement is correct
(c) [ Ni(H 2 O)6 ]2 (d) [Cu (NH 3 )4 ]2
19. [PtNH 3 4 ]Cl 2 is [DCE 2001]
(a) Cu NH 3 6 2 is a colourless ion
(a) Square planar (b) Tetrahedral (b) Zn(H 2 O)6 2 ion is blue coloured
(c) Pyramidal (d) Pentagonal
(c) NiCN 4 2 ion has a tetrahedral shape
20. A complex involving dsp 2 hybridization has
(d) Nickel dimethyl glyoxides is red in colour
(a) A square planar geometry 32. Which of the following shall form an octahedral complex
(b) A tetrahedral geometry [DCE 2001]
(c) An octahedral geometry
(a) d 4 (low spin) (b) d 8 (high spin)
(d) Trigonal planar geometry
(c) d 6 (low spin) (d) None of these
 Co-ordination Chemistry 917
33. Which one of the following is a strong field ligand 2. The most stable ion is [AIEEE 2002]
 3 3
(a) CN (b) NO 2 (a) [Fe(OH )3 ] (b) [Fe(Cl)6 ]
3
(c) en (d) NH 3 (c) [Fe(CN )6 ] (d) [Fe(H 2 O)6 ]3 
34. The strongest ligand in the following is [MP PET 1995] 3. The most stable complex among the following is
(a) CN  (b) Br  [MP PMT 2002]
(a) K 3 [ Al(C 2 O4 )3 ] (b) [Pt(en)2 ]Cl 2
(c) HO  (d) F 
35. The neutral ligand is (c) Ag(NH 3 )2 Cl (d) K 2 (Ni(EDTA)]
(a) Chloro (b) Hydroxo 4. Which of the following factors tends to increase the
(c) Ammine (d) Oxalato stability of metal ion complexes
36. The ligands which can get attached to the central metal (a) Higher ionic radius of the metal ion
ion through more than one atom are called (b) Higher charge/size ratio of the metal ion
(a) Ambident ligands (b) Polydentate ligands (c) Lower ionisation potential of the metal ion
(c) Chelate ligands (d) Neutral ligands (d) Lower basicity of the ligand
37. A strong ligand gives a complex which is generally called 5. CuSO 4 reacts with KCN solution and forms:[DPMT 2004]
(a) High spin (b) High energy (a) K3 [Cu(CN )4 ] (b) Cu (CN )
(c) Low spin (d) Stable (c) Cu (CN )2 (d) K4 [Cu(CN )6 ]
38. CN  is a strong field ligand. This is due to the fact that 6. A co-ordination complex compound of cobalt has the
[CBSE PMT 2004] molecular formulae containing five ammonia molecules,
(a) It can accept electron from metal species one nitro group and two chlorine atoms for one cobalt
(b) It forms high spin complexes with metal species atom. One mole of this compound produces three mole
(c) It carries negative charge. ions in an aqueous solution on reacting with excess of
(d) It is a pseudohalide AgNO3 , AgCl precipitate. The ionic formula for this
39. Considering H 2 O as a weak field ligand, the number of complex would be:
[DPMT 2004; Kerala PMT 2004]
unpaired electrons in [Mn(H 2O)6 ]2  will be (At. No. of Mn
(a) [Co (NH 3 )5 (NO 2 )]Cl2
= 25) asas a ajkk [CBSE PMT 2004]
(b) [Co (NH 3 )5 Cl][Cl(NO 2 )]
(a) Two (b) Four
(c) Three (d) Five (c) [Co (NH 3 )4 (No 2 )Cl][(NH 3 )Cl]
40. Which of the following is a  - complex (d) [Co (NH 3 )5 ][(NO 2 )2 Cl2 ]
(a) Trimethyl aluminium (b) Ferrocene 7. In any ferric salt, on adding potassium ferrocyanide, a
(c) Diethyl zinc (d) Nickel carbonyl prussian blue colour is obtained, which is
41. Which of the following is a   acid ligand [BIT 1992; BHU 2002]
[KCET 1996; AIIMS 2003] (a) K 3 Fe(CN )6 (b) KFeFeCN 6 
(a) NH 3 (b) CO (d) FeSO 4 .Fe(CN )6 (d) Fe4 Fe(CN )6 3

(c) F (d) Ethylene diamine 8. Prussian blue is formed when [CBSE PMT 1990]
42. The value of the ‘spin only’ magnetic moment for one of (a) Ferrous sulphate reacts with FeCl 3
the following configurations is 2.84 BM. the correct one
(b) Ferric sulphate reacts with K 4 Fe(CN )6 
[AIEEE 2005]
(a) d 4 (in strong ligand field) (c) Ferrous ammonium sulphate reacts with FeCl3

(b) d 4 (in weak ligand field) (d) Ammonium sulphate reacts with FeCl 3
(c) d (in weak as well as in strong fields)
3 9. Complex salt can be made by the combination of
(d) d (in strong ligand field)
5 [Co III(NH 3 )5 Cl] X with [RPMT 2000, AFMC 2002]
43. The geometry of Ni(CO)4 and Ni(PPh3)2Cl2 are (a) PO43  (b) Cl 
[BHU 2005]
(a) Both square planer (c) 2Cl  (d) 2 K 
(b) Tetrahedral and square planar respectively 10. Which reagent can be used to identify nickel ion
(c) Both tetrahedral (a) Resorcinol
(d) Square planar and tetrahedral respectively (b) Dimethyl glyoxime [DMG]
(c) Diphenyl benzidine
(d) Potassium ferrocyanide
Complexes and complex stability
11. Dimethyl glyoxime forms a coloured complex with
1. Which of the following complexes has the highest stability (a) Ag (b) Ni
constant at 298 K (c) Cr (d) Zn
(a) CdCl 4  2
(b) CdBr4  2 12. Silver chloride dissolves in excess of NH 4 OH . The cation
present in this solution is [EAMCET 1998]
(c) CdI 4 2 (d) Cd CN 4 2
 918 Co-ordination Chemistry
(a) Ag  (b) AgNH 3 2  9. Among the following, which is not the -bonded
organometallic compound [CBSE PMT 2003]
(c) AgNH 3 4  (d) AgNH 3 6  (a) (CH 3 )4 Sn (b) K[PtCl3 ( 2  C 2 H 4 )]
13. Silver sulphide dissolved in a solution of sodium
cynamide to form the complex [AMU 1999]
(c) Fe( 5  C5 H 5 )2 (d) Cr( 6  C6 H 6 )2
(a) Na[ Ag(CN )2 ] (b) Na 3 [ Ag(CN )4 ] 10. Wilkinson's catalyst is used in
(a) Polymerization (b) Condensation
(c) Na 5 [ Ag(CN )6 ] (d) Na 2 [ Ag(CN )2 ]
(c) Halogenation (d) Hydrogenation
14. Which one will give Fe 3  ions in solution 11. What is the use of tetraethyl lead
(a) FeCN 6 3  (a) As a catalyst in addition reaction of alkenes
(b) As a catalyst in polymerization reaction of alkenes
(b) Fe 2 SO 4 3 (c) For reducing knocking
(c) FeCN 6 4  (d) For creating knocking
12. Which of the following is an organo-metallic compound
(d) NH 4 (SO 4 )2 .FeSO 4 .6 H 2 O [MP PMT 2001]
15. The cation that does not form an amine complex with (a) Lithium ethoxide (b) Ethyl lithium
excess of ammonia is (c) Lithium acetate (d) Lithium carbide
(a) Cd 2  (b) Al 3  13. Which of the following is an organometallic compound
2 
[AIIMS 1997]
(c) Cu (d) Ag (a) TiC 2 H 5 4 (b) Ti(OC 2 H 5 )4
(c) TiOCOCH 3 4 (d) Ti(OC 6 H 5 )4
Application of organometallics 14. Which of the following is not an organometallic
compound
1. Ziegler-Natta catalyst is an organometallic compound of [MP PET 1996; BHU 2002]
which metal [J & K CET 2005] (a) Ethyl magnesium bromide
(a) Iron (b) Zirconium (b) Tetraethyl lead
(c) Rhodium (d) Titanium (c) Sodium ethoxide
2. In the case of small cuts, bleeding is stopped by applying (d) Trimethyl aluminium
potash alum. Here alum acts as 15. An organometallic compound amongst the following is
[KCET (Med.) 2001] (a) Ferrocene (b) CaC 2
(a) Fungicide (b) Disinfectant
(c) Tetraethyl lead (TEL) (d) All of these
(c) Germicide (d) Coagulating agent
16. Which of the following does not have a metal carbon bond
3. The formula of ferrocene is
[CBSE PMT 2004]
(a) Fe(CN )6 4  (b) Fe(CN )6 3  (a) K[Pt(C2 H 4 )Cl3 ] (b) Ni(CO )4
(c) Fe(CO )5  (d) C 5 H 5 2 Fe (c) Al(OC2 H 5 )3 (d) C2 H 5 MgBr
4. Which of the following is formed when n-butyl lithium 17. Coordination compounds have great importance in
reacts with tin (II) chloride [AFMC 2001] biological systems. In this context which of the following
(a) LiBr (b) Et4 Pb statements is incorrect [AIEEE 2004]
(c) (C4 H 9 )4 Sn (d) (C 2 H 5 )4 Pb (a) Cyanocobalamin is B12 and contains cobalt.

5. Which of the following organo-silicon compound on (b) Haemoglobin is the red pigment of blood and
hydrolysis will give a three dimensional silicone contains iron.
[Orissa JEE 2003] (c) Chlorophylls are green pigments in plants and
contains calcium.
(a) R 3 SiCl (b) RSiCl3
(d) Carboxypepticase-A is an enzyme and contains zinc.
(c) SiCl 4 (d) R 2 SiCl 2 18. Ziegler-Natta catalyst is [Pb. CET 2004]
6. Which one is not an organometallic compound (a) (Ph3 P)3 RhCl (b) K[PtCl3 (C2 H 4 )]
[J & K CET 2005; Pb. CET 2003] (c) [ Al2 (C2 H 6 )6 ]  TiCl4 (d) [Fe(C2 H 5 )2 ]
(a) RMgX (b) C 2 H 5 ONa
19. Dimethyl glyoxime gives a red precipitate with Ni 2 ,
(c) CH 3 4 Sn (d) KC 4 H 9 which is used for its detection. To get this precipitate
7. The complex used as an anticancer agent is [AIIMS 2003] readily the best pH range is [AIIMS 2004]
(a) trans [Co (NH 3 )3 Cl 3 ] (b) cis [PtCl2 (NH 3 )2 ] (a) < 1 (b) 2-3
(c) 3-4 (d) 9-11
(c) cis  K 2 [PtCl2 Br2 ] (d) Na 2 CO 3
20. The   bonded organo metallic compound which has
8. The compound that is not olefinic organometallic is ethene as one of its component is [J & K CET 2005]
(a) KC 2 H 4 PtCl3 .3 H 2 O (b) Be(CH 2 )2 (a) Zeise's salt (b) Ferrocene
(c) (C 2 H 4 PtCl3 )2 (d) C 4 H 4 Fe(CO )3 (c) Dibenzene chromium (d) Tetraethyl tin.
 Co-ordination Chemistry 919
10. In the process of extraction of gold,
Roasted gold ore  CN   H 2 O 
[ X ]  OH 
O2

[ X ]  Zn  [Y ]  Au
Identify the complexes [X] and [Y] [
(a) X  [ Au(CN )2 ] , Y  [Zn(CN )4 ]2
1. The coordination number and oxidation state of Cr in (b) X  [ Au(CN )4 ]3  , Y  [Zn(CN )4 ]2
K 3 Cr C 2 O 4 3  are, respectively [CBSE PMT 1995]
(a) 4 and +2 (b) 6 and +3 (c) X  [ Au(CN )2 ] , Y  Zn(CN )6 ]4 
(c) 3 and +3 (d) 3 and 0 (d) X  [ Au(CN )4 ] , Y  [Zn(CN )4 ]2
2. The complex compounds which result from the
11. A solution of potassium ferrocyanide would contains ......
coordination of carbon monoxide are known as [BHU 1999]
ions [KCET 1990]
(a) Electronic (b) Carbonyls
(a) 2 (b) 3
(c) Carbonates (d) Carbon permono
(c) 4 (d) 5
3. Mixture X  0.02 mol of [Co (NH 3 )5 SO 4 ] Br and 0.02
12. Which one of the following complexes is an outer orbital
mol of [Co (NH 3 )5 Br]SO 4 was prepared in 2 litre of complex [AIEEE 2004]
solution (a) [Co (NH 3 )6 ]3  (b) [Mn(CN )6 ]4 
1 litre of mixture X + excess AgNO3  Y .
(c) [Fe(CN )6 ]4  (d) [ Ni(NH 3 )6 ]2 
1 litre of mixture X + excess BaCl2  Z
Number of moles of Y and Z are [IIT JEE 2003]
Atomic nos : Mn  25, Fe  26, Co  27, Ni  28
(a) 0.01, 0.01 (b) 0.02, 0.01 13. Which one of the following has largest number of isomers
(c) 0.01, 0.02 (d) 0.02, 0.02 ?
4. Which of the following organometallic compound is  [AIEEE 2004]
and  bonded [MH CET 2001; PCET 2002] (a) [Ir(PP3 )2 H (CO )] 2
(b) [Co (NH 3 )5 Cl]2 
(a) Fe(CH 3 )3
(c) [Ru(NH 3 )4 Cl 2 ] (d) [Co (en )2 Cl 2 ]
(b) [Fe( 5  C 5 H 5 )2 ]
(R = alkyl group; en = ethylenediamine)
(c) [Co (CO )5 NH 3 ]2 14. Which kind of isomerism is exhibited by octahedral
Co (NH 3 )4 Br2Cl ? [IIT-JEE Screening 2005]
(d) K[PtCl3 (n 2  C 2 H 4 )]
In NiNH 3 4 SO 4 , the valency and coordination number
(a) Geometrical and Ionization
5.
(b) Geometrical and Optical
of Ni will be respectively
(c) Optical and Ionization
(a) 3 and 6 (b) 2 and 4
(d) Geometrical only
(c) 4 and 2 (d) 4 and 4 15. Which one of the following is expected to exhibit optical
6. Co-ordination number of Fe in the complexes isomerism (en = ethylenediamine)
FeCN 6 4  , FeCN 6 3  and FeCl 4  would be (a) cis – [Pt(NH 3 )2 Cl2 ] (b) trans – [Co (en )2 Cl 2 ]
respectively [MP PET 2003] (c) trans – [Pt(NH 3 )2 Cl2 ] (d) cis – [Co (en )2 Cl 2 ]
(a) 2, 3, 3 (b) 6, 6, 4
16. [EDTA]4  is a: [UPSEAT 2004]
(c) 6, 3,3 (d) 6, 4, 6
(a) Monodentate ligand (b) Bidentate ligand
7. On hydrolysis (Me)2 SiCl 2 will produce [IIT-JEE 2003]
(c) Quadridentate ligand (d) Hexadentate ligand
(a) (Me)2 Si(OH )2 17. Which of the following statements is incorrect ?
[KCET 2004]
(b) (Me)2 Si  O
(a) In K3 [Fe(CN )6 ], the ligand has satisfied only the
(c) [O  (Me)2 Si  O ]n  secondary valency of ferric ion.
(d) Me 2 SiCl(OH ) (b) In K3 [Fe(CN )6 ], the ligand has satisfied both primary
8. Which of the following represents a chelating ligand and secondary valencies of ferric ion.
[JIPMER 2002] (c) In K4 [Fe(CN )6 ], the ligand has satisfied both primary
(a) H 2 O (b) OH  and secondary valencies of ferrous ion.
(d) In [Cu(NH 3 )4 ]SO 4 , the ligand has satisfied only the
(c) DMG (d) Cl  secondary valency of copper.
9. CuSO 4 reacts with KCN solution and forms 18. Which of the following is considered as an anticancer
[MP PMT 1992; IIT 1996; UPSEAT 2001, 02] species. [CBSE PMT 2004]
(a) Cu (CN )2 (b) Cu (CN )
(c) K 2 Cu(CN )4  (d) K 3 Cu CN 4 
 920 Co-ordination Chemistry
H 3 N Cl  H 3 N Cl  Reason : NF3 ionizes to give F  ions
   
(a)  Pt  (b)  Pt  ionsiionsionsioiiioioioioioiioioion
 H 3 N Cl  Cl NH 3  ions in aqueous solution.
3. Assertion : The [ Ni(en )3 ]Cl2 (en = ethylene diamine)
 Cl CH 2 
 ||  Cl Cl  has lower stability than [ Ni(NH 3 )6 ]Cl2
 
(c)  Pt CH 2  (d)  Pt  Reason : In [ Ni(en ) 3 ]Cl 2 the geometry of Ni is
Cl Cl  Cl Cl  trigonal bipyramidal
  4. Assertion : The ligands nitro and nitrito are called
19. An aqueous solution of CoCl 2 on addition of excess of ambidentate ligands.
Reason : These ligands give linkage isomers.
concentrated HCl turns blue due to formation of
[AIIMS 2005]
5. Assertion : Geometrical isomerism is also called cis-
trans isomerism.
(a) [Co (H 2O)4 Cl 2 ]
Reason : Tetrahedral complexes show geometrical
(b) [Co (H 2 O)2Cl 4 ]2  isomerism.
3
(c) [CoCl 4 ]2   NH 
 
(d) [Co (H 2 O)2Cl 2 ] 6. Assertion :  (en )2 Co Co (en )2  is named as
20. The correct order for the wavelength of absorption in the  OH 
visible region is [AIIMS 2005] tetrakis (ethylene diamine)  -hydroxo-
(a) [ Ni(NO 2 )6 ]4   [ Ni(NH 3 )6 ]2   [ Ni(H 2 O)6 ]2  imido dicobalt (III) ion.
(b) [ Ni(NO 2 )6 ]4   [ Ni(H 2 O)6 ]2   [ Ni(NH 3 )6 ]2  Reason : In naming polynuclear complexes i.e.,
containing two or more metal atoms joined
(c) [ Ni(H 2 O)6 ]2   [ Ni(NH 3 )6 ]2   [ Ni(NO 2 )6 ]4  by bridging ligands, the word  is added
(d) [ Ni(NH 3 )6 ]2   [ Ni(H 2 O)6 ]2   [ Ni(NO 2 )6 ]4  with hyphen before the name of such
ligands.
21. In which of the following pairs both the complexes show
optical isomerism [AIIMS 2005] 7. Assertion : [Fe(CN )6 ]3  is weakly paramagnetic while
(a) cis- [Cr(C2 O4 )2 Cl 2 ]3  , cis- [Co (NH 3 )4 Cl 2 ] [Fe(CN )6 ]4  is diamagnetic.
(b) [Co (en )3 ]Cl3 , cis- [Co (en)2 Cl 2 ]Cl Reason : [Fe(CN )6 ]3  has +3 oxidation state while
(c) [PtCl(dien)]Cl , [ NiCl2 Br2 ]2  [Fe(CN )6 ]4  has +2 oxidation state.
(d) [Co (NO 3 )3 (NH 3 )3 ] , cis- [Pt(en)2 Cl 2 ] 8. Assertion : H 2 N  NH ` 2 is a chelating ligand.
22. Which of the following compounds shows optical Reason : A chelating ligand must possess two or
isomerism more lone pairs at such a distance that it
[AIEEE 2005; CBSE PMT 2005] may form suitable strain free rings at the
(a) [Cu (NH 3 )4 ] 2
(b) [ZnCl4 ]2  metal ion.
9. Assertion : [Ti(H 2 O)6 ]3  is coloured while
(c) [Cr(C2 O4 )3 ]3  (d) [Co (CN )6 ]3 
3
[Sc (H 2O)6 ] is colourless.
Reason : d-d transition is not possible in
[Sc (H 2O)6 ]3  .
10. Assertion : All the octahedral complexes of Ni 2  must
be outer orbital complexes.
Reason : Outer orbital octahedral complexes are
given by weak ligands.
Read the assertion and reason carefully to mark the correct
11. Assertion : Potassium ferrocyanide is diamagnetic
option out of the options given below :
whereas potassium fericyanide is
(a) If both assertion and reason are true and the reason is paramagnetic.
the correct explanation of the assertion. Reason : Crystal field splitting in ferrocyanide ion is
(b) If both assertion and reason are true but reason is not greater than that of ferricyanide ion.
the correct explanation of the assertion. [AIIMS 2005]
(c) If assertion is true but reason is false.
(d) If the assertion and reason both are false.
(e) If assertion is false but reason is true.

1. Assertion : Potassium ferrocyanide and potassium

ferricyanite both are diamagnetic.
Reason : Both have unpaired electrons.
2. Assertion : NF3 is a weaker ligand than N (CH 3 )3
Basic Terms
 Co-ordination Chemistry 921
21 b 22 d 23 c 24 c 25 c
1 b 2 c 3 b 4 b 5 d
26 d 27 d 28 d 29 d 30 a
6 a 7 b 8 c 9 b 10 c
31 d 32 c 33 a 34 a 35 c
11 d 12 c 13 d 14 b 15 b
36 a 37 c 38 d 39 d 40 b
16 b 17 a 18 c 19 c 20 b
41 b 42 a 43 c
21 b 22 c 23 b 24 d 25 a
26 d 27 a 28 b 29 b 30 c Complexes and complex stability
31 b 32 c 33 b 34 b 35 d
36 d 37 b 38 b 39 d 40 b 1 d 2 d 3 d 4 b 5 a

41 d 42 b 43 d 44 b 45 a 6 a 7 d 8 b 9 c 10 b
46 a 47 d 48 c 49 b 50 d 11 b 12 b 13 a 14 b 15 b
51 a 52 b 53 d 54 a 55 d
56 d 57 a 58 d 59 a 60 d
Application of organometallics
61 c 62 d
1 d 2 d 3 d 4 c 5 b
Nomenclature, oxidation State and EAN number 6 b 7 b 8 a 9 a 10 d
11 c 12 b 13 a 14 c 15 d
1 b 2 c 3 c 4 b 5 d
16 c 17 c 18 c 19 d 20 a
6 c 7 b 8 a 9 a 10 a
11 c 12 a 13 b 14 a 15 b
16 c 17 d 18 b 19 d 20 a
Critical Thinking Questions
21 b 22 b 23 a 24 b 25 a
1 b 2 b 3 a 4 b 5 b
26 d 27 c 28 b 29 a 30 a
6 b 7 c 8 c 9 d 10 a
31 a 32 b 33 a 34 b 35 c
11 d 12 d 13 d 14 a 15 d
36 b 37 a 38 a 39 b 40 c
41 a 42 b 43 c 44 b 45 b 16 d 17 ad 18 a 19 c 20 a

46 d 47 a 48 b 49 c 50 c 21 b 22 c
51 b 52 b 53 c 54 d 55 b
Assertion & Reason
56 a 57 b 58 c

Isomerism and Magnetic properties 1 d 2 c 3 d 4 a 5 c

6 e 7 b 8 e 9 a 10 b
1 a 2 d 3 a 4 c 5 c
11 c
6 d 7 b 8 a 9 a 10 c
11 d 12 d 13 b 14 c 15 a
16 b 17 a 18 d 19 a 20 b
21 c 22 b 23 b 24 a 25 a
26 d 27 d 28 a 29 c 30 a
31 b 32 a 33 c 34 a 35 d
36 c 37 d 38 a 39 d 40 b
41 a 42 c 43 d 44 a 45 b
46 e 47 a 48 d 49 c 50 c
51 d 52 a 53 c 54 a 55 a
56 c 57 c

Hybridisation and Geometry

1 a 2 b 3 a 4 b 5 a
6 b 7 b 8 d 9 c 10 a
11 b 12 c 13 d 14 a 15 b
16 b 17 d 18 d 19 a 20 a