Coordination Compounds JEE Main 2024 - 2019 PYQs

Chapter Priority: Priority A MathonGo

Q1. The F ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surface of
−

teeth) into much harder fluoroapatite having the formula. 09 Apr 2024 (M)
(1) [3 (Ca 3 (PO 4 ) 2 ) ⋅ Ca(OH) 2 ] (2) [3 (Ca 3 (PO 4 ) 3 ) ⋅ CaF 2 ]

(3) [3 (Ca 2 (PO 4 ) 2 ) ⋅ Ca(OH) 2 ] (4) [3 (Ca 3 (PO 4 ) 2 ) ⋅ CaF 2 ]

Q2. Number of ambidentate ligands among the following is ______

NO
−
2
, SCN
−
, C2 O
2−

4
, NH 3 , CN
−
, SO
2−
4
.
, H2 O 09 Apr 2024 (M)

Q3. Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : The total number of geometrical isomers shown by [Co(en) 2 Cl 2 ]
+
complex ion is three.
Reason (R): [Co(en) 2 Cl 2 ]
+
complex ion has an octahedral geometry.
In the light of the above statements, choose the most appropriate answer from the options given below :
09 Apr 2024 (M)
(1) Both (A) and (R) are correct but (R) is not the correct explanation of (A)
(2) (A) is not correct but (R) is correct
(3) Both (A) and (R) are correct and (R) is the correct explanation of (A)
(4) (A) is correct but (R) is not correct

Q4. Match List I with List II

List - I List - II

3
A. K 2 [Ni(CN) 4 ] I. sp

3 2
B. [Ni(CO) 4 ] II. sp d

2
C. [Co(NH 3 ) ]Cl 3 III. dsp
6

2 3
D. Na 3 [CoF 6 ] IV. d sp

Choose the correct answer from the options given below: 09 Apr 2024 (E)
(1) A-III, B-I, C-IV, D-II (2) A-III, B-I, C-II, D-IV
(3) A-I, B-III, C-II, D-IV (4) A-III, B-II, C-IV, D-I

Q5. The coordination environment of Ca 2+

ion in its complex with EDTA 4−
is : 09 Apr 2024 (E)
(1) tetrahedral (2) trigonal prismatic
(3) octahedral (4) square planar

Q6. Match List I with List II

List-I List-II

(Molecule) (Shape)

A. Fe 4 [Fe(CN) 6 ] ⋅ xH 2 O I. Violet
3

4−
B. [Fe(CN) 5 NOS II. Blood Red A

2+
C. [Fe(SCN)] III. Prussian Blue

D. (NH 4 ) PO 4 ⋅ 12MoO 3 IV. Yellow

3

Choose the correct answer from the options given below: 08 Apr 2024 (M)
(1) A-III, B-I, C-II, D-IV (2) A-I, B-II, C-III, D-IV
(3) A-IV, B-I, C-II, D-III (4) A-II, B-III, C-IV, D-I

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Q7. Match List - I with List - II.

List - I List - II

(Complex ion) (Spin only magnetic moment in B.M.)

3+
(A) [Cr(NH 3 ) ] (I) 4.90
6

2−
(B) [NiCl 4 ] (II) 3.87

3−
(C) [CoF 6 ] (III) 0.0

2−
(D) [Ni(CN) 4 ] (IV) 2.83

Choose the correct answer from the options given below : 08 Apr 2024 (E)
(1) (A)-(II), (B)-(III), (C)-(I), (D)-(IV) (2) (A)-(II), (B)-(IV), (C)-(I), (D)-(III)
(3) (A)-(I), (B)-(IV), (C)-(II), (D)-(III) (4) (A)-(IV), (B)-(III), (C)-(I), (D)-(II)

Q8. Total number of unpaired electrons in the complex ions [Co(NH 3 )6 ]

3+
and [NiCl 4]
2−
is 08 Apr 2024 (E)

Q9. Number of Complexes with even number of electrons in t 2g orbitals is -

[Fe(H 2 O) ]
6
2+
, [Co(H 2 O) ]
6
2+
, [Co(H 2 O) ]
6
3+
, [Cu(H 2 O) ]
6
2+
, [Cr(H 2 O) ]
6
2+
08 Apr 2024 (M)
(1) 2 (2) 3
(3) 1 (4) 5

Q10. An octahedral complex with the formula CoCl 3 ⋅ nNH 3 upon reaction with excess of AgNO solution gives 2 3

moles of AgCl. Consider the oxidation state of Co in the complex is ' x '. The value of " x + n " is ______
08 Apr 2024 (M)
(1) 6 (2) 8
(3) 3 (4) 5

Q11. The correct IUPAC name of [PtBr 2 (PMe 3 ) 2 ] is : 06 Apr 2024 (E)
(1) dibromodi(trimethylphosphine)platinum(II) (2) bis(trimethylphosphine)dibromoplatinum(II)
(3) dibromobis(trimethylphosphine)platinum(II) (4) bis[bromo(trimethylphosphine)]platinum(II)

Q12. Given below are two statements :

Statement I : PF 5 and BrF both exhibit sp
5
3
d hybridisation.
Statement II : Both SF and [Co(NH6 3 )6 ]
3+
exhibit sp 3
d
2
hybridisation.
In the light of the above statements, choose the correct answer from the options given below : 06 Apr 2024 (E)
(1) Statement I is true but Statement II is false (2) Statement I is false but Statement II is true
(3) Both Statement I and Statement II are true (4) Both Statement I and Statement II are false

Q13. he following complexes

2+ 3− 3+ 2+
[CoCl(NH 3 ) ] , [Co(CN) 6 ] , [Co(NH 3 ) (H 2 O)] , [Cu(H 2 O) ]
5 5 4

(A) (B) (C) (D)

The correct order of A, B, C and D in terms of wavenumber of light absorbed is : 06 Apr 2024 (M)
(1) C < D < A < B (2) B < C < A < D
(3) A < C < B < D (4) D < A < C < B

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Q14. Match List - I with List - II.

List - I List - II

Reaction Type of redox reaction

2 0
(A) TiCl 4 (I) e , t
2

2− 4 3
(B) [FeO 4 ] (II) e , t
2

− 0 0
(C) [FeCl 4 ] (III) e , t
2

2− 2 3
(D) [CoCl 4 ] (IV) e , t
2

Choose the correct answer from the options given below : 06 Apr 2024 (E)
(1) (A)-(III), (B)-(IV), (C)-(II), (D)-(I) (2) (A)-(IV), (B)-(III), (C)-(I), (D)-(II)
(3) (A)-(III), (B)-(I), (C)-(IV), (D)-(II) (4) (A)-(I), (B)-(III), (C)-(IV), (D)-(II)

Q15. The correct order of ligands arranged in increasing field strength. 05 Apr 2024 (M)
(1) F −
< Br
−
< I
−
< NH 3 (2) Br −
< F
−
< H 2 O < NH 3

(3) H 2
O < −OH < CN
−
< NH 3 (4) Cl −
< −OH < Br
−
< CN
−

Q16. Which one of the following complexes will exhibit the least paramagnetic behaviour?
[Atomic number, Cr = 24, Mn = 25, Fe = 26, Co = 27 ] 05 Apr 2024 (M)
(1) [Cr(H 2
O) ]
6
2+
(2) [Fe(H 2
O) ]
6
2+

(3) [Co(H 2
O) ]
6
2+
(4) [Mn(H 2
O) ]
6
2+

Q17. The metal atom present in the complex MABXL (where A, B, X and L are unidentate ligands and M is metal)
involves sp hybridization. The number of geometrical isomers exhibited by the complex is:
3
05 Apr 2024 (E)
(1) 2 (2) 0
(3) 4 (4) 3

Q18. The number of complexes from the following with no electrons in the t orbital is 2

TiCl 4 , [MnO 4 ]
−
, [FeO 4 ]
2−
, [FeCl 4 ]
−
, [CoCl 4 ]
2−
05 Apr 2024 (E)
(1) 1 (2) 4
(3) 3 (4) 2

Q19. The correct sequence of ligands in the order of decreasing field strength is : 04 Apr 2024 (M)
(1) NCS −
> EDTA
4−
> CN
−
> CO (2) CO > H 2
O > F
−
> S
2−

(3) S 2−
> −OH > EDTA
4−
> CO (4) −
OH > F
−
> NH 3 > CN
−

Q20. The number of unpaired d-electrons in [Co(H 2

O) ]
6
3+
is 04 Apr 2024 (E)
(1) 2 (2) 1
(3) 0 (4) 4

Q21. Number of complexes from the following with even number of unpaired " d " electrons is
3+ 2+ 3+ 3+ 2+
[V(H 2 O) ] , [Cr(H 2 O) ] , [Fe(H 2 O) ] , [Ni(H 2 O) ] , [Cu(H 2 O) ]
6 6 6 6 6

[Given atomic numbers : V = 23, Cr = 24, Fe = 26, Ni = 28Cu = 29] 04 Apr 2024 (M)
(1) 2 (2) 1
(3) 4 (4) 5

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Q22. If an iron (III) complex with the formula [Fe(NH 3 ) x (CN) y ]

−
has no electron in its e orbital, then the value of
g

x + y is 04 Apr 2024 (E)

(1) 4 (2) 5
(3) 6 (4) 3

Q23. Which of the following complex is homoleptic? 01 Feb 2024 (M)

(1) [Ni(CN) 4]
2−
(2) [Ni (NH 3 )2 Cl 2 ]

(3) [Fe (NH 3 )4 Cl 2 ]

+
(4) [Co (NH 3 )4 Cl 2 ]
+

Q24. Given below are two statements :

Statement (I) : Dimethyl glyoxime forms a six membered covalent chelate when treated with NiCl solution in 2

presence of NH 4 OH.

Statement (II) : Prussian blue precipitate contains iron both in (+2) and (+3) oxidation states.
In the light of the above statements, choose the most appropriate answer from the options given below:
01 Feb 2024 (E)
(1) Statement I is false but Statement II is true (2) Both Statement I and Statement II are true
(3) Both Statement I and Statement II are false (4) Statement I is true but Statement II is false

Q25. Given below are two statements:

Statement (I): A solution of [Ni (H 2 O) 6 ]
2+
is green in colour.
Statement (II): A solution of [Ni(CN) 4]
2−
is colourless.
In the light of the above statements, choose the most appropriate answer from the options given below:
01 Feb 2024 (M)
(1) Both Statement I and Statement II are incorrect
(2) Both Statement I and Statement II are correct
(3) Statement I is incorrect but Statement II is correct
(4) Statement I is correct but Statement II is incorrect

Q26. [Co (NH 3 )6 ]

3+
and [CoF 6]
3−
are respectively known as: 01 Feb 2024 (E)
(1) Spin free Complex, Spin paired Complex (2) Spin paired Complex, Spin free Complex
(3) Outer orbital Complex, Inner orbital Complex (4) Inner orbital Complex, Spin paired Complex

Q27. The correct statements from the following are:

A. The strength of anionic ligands can be explained by crystal field theory.
B. Valence bond theory does not give a quantitative interpretation of kinetic stability of coordination
compounds.
C. The hybridization involved in formation of [Ni(CN) 4]
2–
complex is dsp . 2

D. The number of possible isomer(s) of cis-[PtCl 2 (en) 2 ]

2+
is one
Choose the correct answer from the options given below:
31 Jan 2024 (M)
(1) A, D only (2) A, C only
(3) B, D only (4) B, C only

Q28. Select the option with correct property: 31 Jan 2024 (E)

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(1) [N i(CO) ] and [N iCl

4 4]
2−
both diamagnetic
(2) [N i(CO) ] and [N iCl
4 4]
2−
both paramagnetic
(3) [N iCl 4]
2−
diamagnetic, [N i(CO) ] paramagnetic 4

(4) [N i(CO) ] diamagnetic, [N iCl

4 4]
2−
paramagnetic

Q29. Match List I with List II

LIST – II
LIST – I
(Electronic
(Complex ion)
Configuration
A. [Cr(H 2 O) ]
6
3+
I. t
2
2g
e
0
g

B. [F e(H 2 O) ]
6
3+
II. t
3
2g
e
0
g

C. [N i(H 2 O) ]
6
2+
III. t
3
2g
e
2
g

D. [V (H 2 O) ]
6
3+
IV. t
6
2g
e
2
g

Choose the correct answer from the options given below :

31 Jan 2024 (E)
(1) A-III, B-II, C-IV, D-I (2) A-IV, B-I, C-II, D-III
(3) A-IV, B-III, C-I, D-II (4) A-II, B-III, C-IV, D-I

Q30. The molecule/ion with square pyramidal shape is: 30 Jan 2024 (E)
(1) [Ni(CN) 4]
2−
(2) PCl 5

(3) BrF 5 (4) PF 5

Q31. Choose the correct Statements from the following:

(A) Ethane − 1 , 2 − diamine is a chelating ligand.
(B) Metallic aluminium is produced by electrolysis of aluminium oxide in presence of cryolite.
(C) Cyanide ion is used as ligand for leaching of silver.
(D) Phosphine act as a ligand in Wilkinson catalyst.
(E) The stability constants of Ca 2+
and Mg 2+
are similar with EDTA complexes.
Choose the correct answer from the options given below: 30 Jan 2024 (M)
(1) (B), (C), (E) only (2) (C), (D), (E) only
(3) (A), (B), (C) only (4) (A), (D), (E) only

Q32. Number of complexes which show optical isomerism among the following is _________.
3− 3+ 2+ +
cis −[Cr(ox) 2 Cl 2 ] , [Co(en) 3 ] , cis − [Pt(en) 2 Cl 2 ] , cis − [Co(en) 2 Cl 2 ]

​, trans −[Pt(en) 2 Cl 2 ]
2+
, trans − [Cr(ox) 2 Cl 2 ]
3−

30 Jan 2024 (E)

Q33. Aluminium chloride in acidified aqueous solution forms an ion having geometry 30 Jan 2024 (M)
(1) Octahedral (2) Square Planar
(3) Tetrahedral (4) Trigonal bipyramidal

Q34. The coordination geometry around the manganese in decacarbonyldimanganese(0)

30 Jan 2024 (E)

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(1) Octahedral (2) Trigonal bipyramidal

(3) Square pyramidal (4) Square planar

Q35. The correct IUPAC name of K 2 MnO 4 is:

29 Jan 2024 (E)
(1) Potassium tetraoxopermanganate (VI) (2) Potassium tetraoxidomanganate (VI)
(3) Dipotassium tetraoxidomanganate (VII) (4) Potassium tetraoxidomanganese (VI)

Q36. In which one of the following metal carbonyls, CO forms a bridge between metal atoms? 29 Jan 2024 (M)
(1) [Co 2 (CO) 8 ] (2) [Mn 2 (CO) 10 ]

(3) [Os 3 (CO) 12 ] (4) [Ru 3 (CO) 12 ]

Q37. Identity the incorrect pair from the following: 27 Jan 2024 (E)
(1) Photography - AgBr (2) Polythene preparation - TiCl 4, Al (CH 3 )
3

(3) Haber process - Iron (4) Wacker process - PtCl 2

Q38. Yellow compound of lead chromate gets dissolved on treatment with hot NaOH solution. The product of lead
formed is a : 27 Jan 2024 (M)
(1) Tetraanionic complex with coordination number six
(2) Neutral complex with coordination number four
(3) Dianionic complex with coordination number six
(4) Dianionic complex with coordination number four

Q39. Consider the following complex ions

P = [FeF 6 ]
3–
, Q = [V(H 2 O) 6]
2+
, R = [Fe(H 2 O) 6 ]
2+

The correct order of the complex ions, according to their spin only magnetic moment values (in B.M.) is :
27 Jan 2024 (M)
(1) R < Q < P (2) R < P < Q

(3) Q < R < P (4) Q < P < R

Q40. Identify from the following species in which d 2

sp
3
hybridization is shown by central atom: 27 Jan 2024 (E)
(1) [Co (NH 3 )6 ]
3+
(2) BrF 5

(3) [Pt(Cl) 4]
2−
(4) SF 6

Q41. The Spin only magnetic moment value of square planar complex [Pt (NH 3 )2 Cl(NH 2 CH 3 )] Cl is _______
B.M. (Nearest integer)
( Given atomic number for Pt = 78) 27 Jan 2024 (E)

Q42. The volume (in mL) of 0. 1 M AgNO

3
required for complete precipitation of chloride ions present in 20 mL

of 0. 01 M solution of [Cr (H 2 O) 5 Cl] Cl 2 as silver chloride is_______ 15 Apr 2023 (M)

Q43. The homoleptic and octahedral complex of Co

2+
and H2 O has ______ unpaired electron(s) in the t 2g set of
orbitals.
15 Apr 2023 (M)

Q44. The complex with highest magnitude of crystal field splitting energy (Δ 0) is 15 Apr 2023 (M)

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(1) [Ti(OH 2 )6]

3+
(2) [Cr (OH 2 )6 ]
3+

(3) [Mn (OH 2 )6 ]

3+
(4) [Fe (OH 2 )6 ]
3+

Q45. The mismatched combinations are

A. Chlorophyll– Co B. Water hardness– EDTA
C. Photography−[Ag(CN) 2]
−
D. Wilkinson catalyst−[(Ph 3 P)
3
RhCl]

E. Chelating ligand–D−Penicillamine
Choose the correct answer from the options given below. 13 Apr 2023 (M)
(1) A, C and E only (2) A and C only
(3) A and E only (4) D and E only

Q46. The covalency and oxidation state respectively of boron in [BF 4]

−
, are 13 Apr 2023 (E)
(1) 3 and 5 (2) 3 and 4
(3) 4 and 4 (4) 4 and 3

Q47. The total number of stereoisomers for the complex [Cr(ox) 2 ClBr]
3–
(where ox = oxalate) is 13 Apr 2023 (E)
(1) 3 (2) 2
(3) 4 (4) 1

Q48. Which of the following complexes will exhibit maximum attraction to an applied magnetic field?
13 Apr 2023 (E)
(1) [Ni(H 2 O) 6 ]
2+
(2) [Co(en) 3 ]
3+

(3) [Zn(H 2 O) 6 ]
2+
(4) [Co(H 2 O) 6 ]
2+

Q49. Match List I with List II

List I Complex List II CF SE (Δ 0
)

A. [Cu(N H 3 ) ]
6
2+
I. −0. 6

B. [T i(H 2 O) ]
6
3+
II. −2. 0

C. [F e(CN ) ]
6
3−
III. −1. 2

D. [N iF 6 ]
4−
IV. −0. 4

Choose the correct answer from the options given below:

12 Apr 2023 (M)
(1) A(III), B(IV), C(I), D(II) (2) A(I), B(IV), C(II), D(III)
(3) A(I), B(II), C(IV), D(III) (4) A(II), B(III), C(I), D(IV)

Q50. The set which does not have ambidentate ligand(s) is 11 Apr 2023 (M)
(1) C2 O
2−

4
, ethylene diammine, H 2
O (2) EDTA 4−
, NCS
−
, C2 O
2−

(3) , EDTA 4- (4) 2− − −

− 2−
NO , C2 O C2 O , NO , NCS
4 2
2 4

Q51. The magnetic moment is measured in Bohr Magneton (BM). Spin only magnetic moment of Fe in
[Fe (H 2 O) ]
6
3+
and [Fe (CN) 6
]
3−
complexes respectively is: 11 Apr 2023 (E)
(1) 6. 92 B. M. in both (2) 3. 87 B. M. and1. 732 B. M.
(3) 5. 92 B. M. and 1. 732 B. M. (4) 4. 89 B. M. and 6. 92 B. M.

Q52. Which of the following complex has a possibility to exist as meridional isomer? 11 Apr 2023 (M)

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(1) [Co(NH 3 ) 3 (NO 2 ) 3 ] (2) [Pt (NH 3 ) 2 Cl 2 ]

(3) [Co(en) 2 Cl 2 ] (4) [Co(en) 3 ]

Q53. If Ni 2+
is replaced by Pt 2+
in the complex [NiCl 2 Br 2 ]
2−
, which of the following properties are expected to
get changed?
A. Geometry B. Geometrical isomerism C. Optical isomerism D. Magnetic properties 11 Apr 2023 (E)
(1) A and D (2) A, B and C
(3) B and C (4) A, B and D

Q54. The ratio of spin-only magnetic moment values μ ef f [Cr(CN) 6 ]

3−
/ μ ef f [Cr(H 2 O)6]
3+
is _______
11 Apr 2023 (M)

Q55. Match List I with List II

LIST-I LIST-II
Complex Colour
A. Mg(NH 4 ) PO 4 I. brown
B. K 3 [Co (NO 2 ) ]
6
II. white
C. MnO (OH)
2
III. yellow
D. Fe 4 [Fe (CN) ]
6 3
IV. blue
Choose the correct answer from the options given below:
11 Apr 2023 (E)
(1) A-III, B-IV, C-II, D-I (2) A-II, B-III, C-I, D-IV
(3) A-II, B-IV, C-I, D-III (4) A-II, B-III, C-IV, D-I

Q56. Given below are two statements, one is labelled as assertion A and the other is labelled as Reason R.
assertion A : [CoCl (NH 3 )5 ]
2+
absorbs at lower wavelength of light with respect to [Co (NH 3 ) 5 (H 2 O)]
3+

Reason R: It is because the wavelenght of light absorbed depends on the oxidation state of the metal ion.
In the light of the above statements,choose the correct answer from the options given below: 11 Apr 2023 (E)
(1) A is false but R is true
(2) A is true but R is false
(3) Both A and R are true and R is the correct explaination of A
(4) Both A and R are true and R is NOT the correct explaination of A

Q57. The complex that dissolves in water is 11 Apr 2023 (M)

(1) (NH 4 ) 3 [As (Mo 3 O 10 ) ]
4
(2) Fe 4 [Fe(CN) 6 ]
3

(3) K 3 [Co (NO 2 ) ]

6
(4) [Fe 3 (OH) 2 (OAc) 6 ] Cl

Q58. The octahedral diamagnetic low spin complex among the following is 10 Apr 2023 (M)
(1) [Co (NH 3 )6 ]
3+
(2) [CoF 6]
3−

(3) [CoCl 6]
3−
(4) [NiCl 4]
2

Q59. The correct order of the number of unpaired electrons in the given complexes is
(A) [Fe(CN) 6]
3−
(B) [FeF 6]
3−
(C) [CoF 6]
3−
(D) [Cr( oxalate ) 3 ]
3−
(E) [Ni(CO) 4]

Choose the correct answer from the options given below:

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10 Apr 2023 (E)

(1) E < A < D < C < B (2) E < A < B < D < C

(3) A < E, C < B < D (4) A < E < D < C < B

Q60. In potassium ferrocyanide, there are ______ pairs of electrons in the t 2g set of orbitals. 10 Apr 2023 (M)

Q61. Match List-I with List-II.

Choose the correct answer from the options given below:

10 Apr 2023 (E)
(1) A-II, B-IV, C-I, D-III (2) A-IV, B-I, C-III, D-II
(3) A-IV, B-I, C-II, D-III (4) A-II, B-IV, C-III, D-I

Q62. The observed magnetic moment of the complex [Mn(NCS) 6

)]
x−
is 6. 06 BM . The numerical value of x is
08 Apr 2023 (E)

Q63. The sum of oxidation state of the metals in Fe(CO) , VO 5

2+
and WO is 3
08 Apr 2023 (E)

Q64. Which of the following complex is octahedral, diamagnetic and the most stable? 08 Apr 2023 (M)
(1) Na 3
[CoCl 6 ] (2) [Ni (NH 3
) ] Cl 2
6

(3) K 3 [Co(CN) 6 ] (4) [Co (H 2

O) ] Cl 2
6

Q65. The correct order of spin only magnetic moments for the following complex ions is 08 Apr 2023 (M)
(1) [Fe(CN) 6
]
3−
< [CoF 6 ]
3−
< [MnBr 4 ]
2−
< [Mn(CN) 6 ]
3−

(2) [CoF 6
]
3−
< [MnBr 4 ]
2−
< [Fe(CN) 6 ]
3−
< [Mn(CN) 6 ]
3−

(3) [Fe(CN) 6
]
3−
< [Mn(CN) 6 ]
3−
< [CoF 6 ]
3−
< [MnBr 4 ]
2−

(4) [MnBr 4
]
2−
< [CoF 6 ]
3−
< [Fe(CN) 6 ]
3−
< [Mn(CN) 6 ]
3−

Q66. Match List-I with List-II

LIST-I
LIST-II
Coordination
Number of unpaired electrons
Complex
A. [Cr(CN) 6 ]
3−
I. 0
B. [Fe (H 2 O) ]
6
2+
II. 3
C. [Co (NH 3 ) ]
6
3+
III. 2
D. [Ni (NH 3 ) ]
6
2+
IV. 4
Choose the correct answer from the options given below:

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08 Apr 2023 (E)

(1) A-II, B-IV, C-I, D-III (2) A-III, B-IV, C-I, D-II
(3) A-II, B-I, C-IV, D-III (4) A-IV, B-III, C-II, D-I

Q67. Number of ambidentate ligands in a representative metal complex [M(en)(SCN) 4 ] is _________. [en =
ethylenediamine]
06 Apr 2023 (M)

Q68. The IUPAC name of K 3 [Co(C 2 O 4 ) 3 ] is: 06 Apr 2023 (E)

(1) Potassium tris(oxalato)cobaltate(III) (2) Potassium tris(oxalato)cobalt(III)
(3) Potassium trioxalatocobalt(III) (4) Potassium trioxalatocobaltate(III)

Q69. Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: The spin only magnetic moment value for [Fe(CN) 6 ]
3−
is 1. 74 BM, whereas for [Fe(H2O)6]
[Fe (H 2 O) ]
6
3+
is 5. 92 BM.

Reason B: In both complexes, Fe is present in +3 oxidation state.

In the light of the above statements, choose the correct answer from the options given below:
06 Apr 2023 (M)
(1) A is false but R is true
(2) A is true but R is false
(3) Both A and R are true but R is NOT the correct explanation of A
(4) Both A and R are true andR is the correct explanation of A

Q70. Given below are two statements: one is labelled as “Assertion A” and the other is labelled as “Reason R”
Assertion A : In the complex Ni(CO) and Fe(CO) , the metals have zero oxidation state.
4 5

Reason R : Low oxidation states are found when a complex has ligands capable of π -donor character in
addition to the σ-bonding.
In the light of the above statements, choose the most appropriate answer from the options given below
06 Apr 2023 (E)

(1) A is correct but R is not correct

(2) A is not correct but R is correct
(3) Both A and R are correct but R is NOT the correct explanation of A
(4) Both A and R are correct and R is the correct explanation of A
Q71. Which of the following are the example of double salt?
(A) FeSO 4 ⋅ (NH 4 )
2
SO 4 ⋅ 6H 2 O (B) CuSO 4 ⋅ 4 NH 3 ⋅ H 2 O

(C) K 2 SO 4 ⋅ Al 2 (SO 4 )
3
⋅ 24H 2 O (D) Fe(CN) 2 ⋅ 4 KCN

Choose the correct answer. 01 Feb 2023 (M)

(1) A and C only (2) A and B only
(3) A, B and D only (4) B and D only

Q72. The spin only magnetic moment of [Mn (H 2 O) 6 ]

2+
complexes is B. M. (Nearest integer)
(Given atomic number of Mn = 25) 01 Feb 2023 (E)

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Q73. Which of the following complex will show largest splitting of d-orbitals? 01 Feb 2023 (M)
(1) [Fe (C 2 O4 )3 ]
3−
(2) [FeF 6]
3−

(3) [Fe(CN) 6]
3−
(4) [Fe (NH 3 )6 ]
3+

Q74. The complex cation which has two isomers is: 01 Feb 2023 (E)
(1) [Co (H 2 O) 6 ]
3+
(2) [Co (NH 3 )5 Cl]
2+

(3) [Co (NH 3 )5 NO 2 ]

2+
(4) [Co (NH 3 )5 Cl]
+

Q75. Cobalt chloride when dissolved in water forms pink colored complex X which has octahedral geometry. This
solution on treating with cone HCl forms deep blue complex, Y which has a Z geometry. X, Y and Z,
respectively, are 31 Jan 2023 (M)
(1) X = [Co (H 2 O) 6 ]
2+
, Y = [CoCl 4 ]
2−
, Z = Tetrahedral

(2) X = [Co(H 2 O 6 )]
2+
, Y = [CoCl 6 ]
3−
, Z = Octahedral

(3) X = [Co (H 2 O) 6 ]
3+
, Y = [CoCl 6 ]
3−
, Z = Octahedral

(4) X = [Co (H 2 O) 4 Cl 2 ]
+
, Y = [CoCl 4 ]
2−
, Z = Tetrahedral

Q76. If the CFSE of [Ti (H 2 O) ]

6
3+
is −96. 0 kJ / mol , this complex will absorb maximum at wavelength nm.
(nearest integer)
Assume Planck' constant (h) = 6. 4 × 10
−34
Js , Speed of light (c) = 3. 0 × 10
8
m/s and Avogadro's constant
(N A ) = 6 × 10
23
/ mol .
31 Jan 2023 (E)

Q77. Which of the following is correct order of ligand field strength? 30 Jan 2023 (M)
(1) CO < en < NH 3 < C2 O
2−

4
< S
2−
(2) S 2−
< C2 O
2−

4
< NH 3 < en < CO

(3) NH 3 < en < CO < S

2−
< C2 O
2−

4
(4) S 2−
< NH 3 < en < CO < C 2 O
2−

Q78. Match List I with List II:

List I List II
(Complexes) (Hybridisation)
(A) [Ni(CO) 4 ] I sp
3

(B) [Cu (NH 3 ) ]

4
2+
II dsp
2

(C) [Fe (NH 3 ) ]

6
2+
III sp
3
d
2

(D) [Fe (H 2 O) ]
6
2+
IV d
2
sp
3

30 Jan 2023 (E)

(1) A – II, B – I, C – III, D – IV (2) A – I, B – II, C – III, D – IV
(3) A – II, B – I, C – IV, D – III (4) A – I, B– II, C – IV, D – III

Q79. To inhibit the growth of tumours, identify the compounds used from the following:
(A) EDTA (B) Coordination Compounds of Pt (C) D-Penicillamine (D) Cis - Platin
Choose the correct answer from the option given below: 30 Jan 2023 (M)
(1) B and D Only (2) C and D Only
(3) A and B Only (4) A and C Only

Q80. The Cl − Co − Cl bond angle values in a fac- [Co (NH 3 )3 Cl 3 ] complex is/are: 30 Jan 2023 (E)

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(1) 90° & 180° (2) 90°

(3) 180° (4) 90° & 120°

Q81. 1 L, 0. 02M solution of [Co (NH 3 )5 SO 4 ] Br is mixed with 1 L, 0. 02M solution of [Co (NH 3 )5 Br] SO 4 . The
resulting solution is divided into two equal parts (X) and treated with excess AgNO solution and BaCl 3 2

solution respectively as shown below:

1 L Solution (X) + AgNO solution (excess) → Y 3

1 L Solution (X) + BaCl solution (excess) → Z 2

The number of moles of Y and Z respectively are 30 Jan 2023 (E)

(1) 0. 02, 0. 02 (2) 0. 01, 0. 01
(3) 0. 02, 0. 01 (4) 0. 01, 0. 02

Q82. Correct order of spin only magnetic moment of the following complex ions is:
(Given At. No. Fe : 26, Co : 27 ) 29 Jan 2023 (E)
(1) [FeF 6]
3−
> [CoF 6 ]
3−
> [Co (C 2 O 4 ) ]
3
3−
(2) [Co (C 2 O4 )3 ]
3−
> [CoF 6 ]
3−
> [FeF 6 ]
3−

(3) [FeF 6]
3−
> [Co (C 2 O 4 ) ]
3
3−
> [CoF 6 ]
3−
(4) [CoF 6]
3−
> [FeF 6 ]
3−
> [Co (C 2 O 4 ) ]
3
3−

Q83. The denticity of the ligand present in the Fehling's reagent is _____ . 29 Jan 2023 (E)

Q84. The sum of bridging carbonyls in W(CO) and Mn 6 2 (CO)

10
is _____ . 29 Jan 2023 (M)

Q85. Chiral complex from the following is :

Here en = ethylene diamine 29 Jan 2023 (M)
(1) cis −[PtCl 2 (en) 2 ]
2+
(2) trans −[PtCl 2 (en) 2 ]
2+

(3) cis −[PtCl 2 (NH 3 ) ]

2
(4) trans −[Co (NH 3 )4 Cl 2 ]
+

Q86. How many of the following metal ions have similar value of spin only magnetic moment in gaseous state?
________
(Given: Atomic number: V, 23; Cr, 24; Fe, 26; Ni, 28)

V
3+
, Cr
3+
, Fe
2+
, Ni
3+
25 Jan 2023 (M)

Q87. Total number of moles of AgCl precipitated on addition of excess of AgNO to one mole each of the following 3

complexes [Co (NH 3 )4 Cl 2 ] Cl , [Ni (H 2 O) 6 ] Cl 2 , [Pt (NH 3 )

2
Cl 2 ] and [Pd (NH 3 )4 ] Cl 2 is 25 Jan 2023 (E)

Q88. The number of paramagnetic species from the following is

2− 2− 4− 2+
[Ni(CN) 4 ] , [Ni(CO) 4 ], [NiCl 4 ] [Fe(CN) 6 ] , [Cu (NH 3 ) ]
4

3− 2+
[Fe(CN) 6 ] and [Fe (H 2 O) ]
6

25 Jan 2023 (M)

Q89. Match List I with List II

List I List II
Coordination entity Wavelength of light absorbed in nm
A [CoCl (NH 3 ) ]
5
2+
I. 310

B [Co (NH 3 ) ]
6
3+
II. 475

C [Co(CN) 6 ]
3−
III. 535

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D [Cu (H 2 O) ]
4
2+
IV. 600

Choose the correct answer from the options given below :-

25 Jan 2023 (E)
(1) A − IV, B − I, C − III, D − II (2) A − III, B − II, C − I, D − IV

(3) A − III, B − I, C − II, D − IV (4) A − II, B − III, C − IV, D − I

Q90. The primary and secondary valencies of cobalt respectively in [Co(NH 3 )5 Cl] Cl 2 are: 24 Jan 2023 (M)
(1) 3 and 5 (2) 2 and 6
(3) 2 and 8 (4) 3 and 6

Q91. The d-electronic configuration of [CoCl 4 ]

2−
in tetrahedral crystal field is e m
t
n
2
. The sum of m and number of
unpaired electrons is 24 Jan 2023 (M)

Q92. The hybridization and magnetic behaviour of cobalt ion in [Co(NH 3 )6 ]

3+
complex, respectively is
24 Jan 2023 (E)
(1) sp 3
d
2
and diamagnetic (2) d 2
sp
3
and paramagnetic
(3) d 2
sp
3
and diamagnetic (4) sp 3
d
2
and paramagnetic

Q93. Which of the following cannot be explained by crystal field theory? 24 Jan 2023 (E)
(1) The order of spectrochemical series
(2) Magnetic properties of transition metal complexes
(3) Colour of metal complexes
(4) Stability of metal complexes

Q94. Sum of oxidation state (magnitude) and coordination number of cobalt in Na[Co(bpy) Cl ] is 4

29 Jul 2022 (E)

Q95. [Fe (CN) 6

]
3−
should be an inner orbital complex. Ignoring the pairing energy, the value of crystal field
stabilization energy for this complex is (−)_____Δ . 0 29 Jul 2022 (M)

Q96. Octahedral complexes of copper (II) undergo structural distortion (Jahn-Teller). Which one of the given
copper (II) complexes will show the maximum structural distortion?
(en-ethylenediamine; H 2N − CH 2 − CH 2 − NH 2 ) 29 Jul 2022 (E)
(1) [Cu (H 2 O) 6 ] SO 4 (2) [Cu(en)(H 2 O) 4 ] SO 4

(3) cis-[Cu (en) 2

Cl 2 ] (4) trans-[Cu (en) 2
Cl 2 ]

Q97. Match List-I with List-II

List-I List-II
(Complex) (Hybridization)
A Ni (CO)
4
I sp
3

B [Ni (CN) ]
4
2−
II sp
3
d
2

C [Co (CN) ]
6
3−
III d
2
sp
3

D [CoF 6 ]
3−
IV dsp
2

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Choose the correct answer from the options given below

28 Jul 2022 (E)
(1) A − IV, B − I, C − III, D − II (2) A − I, B − IV, C − III, D − II
(3) A − I, B − IV, C − II, D − III (4) A − IV, B − I, C − II, D − III

Q98. Total number of relatively more stable isomer(s) possible for octahedral complex [Cu (en) 2
(SCN) ]
2
will
be____ 28 Jul 2022 (M)

Q99. The conductivity of a solution of complex with formula CoCl 3 (NH 3 )

4
corresponds to 1 : 1 electrolyte, then
the primary valency of central metal ion is 27 Jul 2022 (M)

Q100. Fe 3+
cation gives a prussian blue precipitate on addition of potassium ferrocyanide solution due to the
formation of 27 Jul 2022 (E)
(1) [Fe (H 2 O) 6 ]
2
[Fe (CN) ]
6
(2) Fe 2 [Fe (CN) ]
6 2

(3) Fe 3 [Fe (OH) (CN) ]

2 4 2
(4) Fe 4 [Fe (CN) ]
6 3

Q101. Low oxidation state of metals in their complexes are common when ligands 27 Jul 2022 (E)
(1) have good π-accepting character (2) have good σ-donor character
(3) are havind good π-donating ability (4) are havind poor σ-donating ability

Q102. The spin only magnetic moment of the complex present in Fehling's reagent is____B. M. (Round off your
answer to the nearest integer) 27 Jul 2022 (E)

Q103. The difference between spin only magnetic moment values of [Co (H 2 O) 6 ] Cl 2 and [Cr (H 2 O) 6 ] Cl 3 is
26 Jul 2022 (M)

Q104. The metal complex that is diamagnetic is (Atomic number : Fe, 26; Cu, 29) 26 Jul 2022 (E)
(1) K 3 [Cu (CN) ]
4
(2) K 2 [Cu (CN) ]
4

(3) K 3 [Fe (CN) ] 4

(4) K 4 [FeCl 6 ]

Q105. The spin-only magnetic moment value of M 3+

ion (in gaseous state) from the pairs
Cr
3+
/ Cr
2+
, Mn
3+ 2
/ Mn , Fe
3+
/ Fe
2+
and Co 3+
/ Co
2+
that has negative standard electrode potential,
is_____ B. M. 25 Jul 2022 (E)

Q106. Consider the following metal complexes :

[Co(NH 3 )]
3+
, [CoCl (NH 3 ) ]
5
2+
, [Co(CN) 6 ]
3−
, [Co (NH 3 ) (H 2 O)]
5
3+

The spin-only magnetic moment value of the complex that absorbs light with shortest wavelength is B.M.
(Nearest integer)
25 Jul 2022 (M)

Q107. The correct order of energy of absorption for the following metal complexes is
2+ 2+ 2+
A : [Ni (en) ] , B : [Ni (NH 3 ) ] , C : [Ni (H 2 O) ]
3 6 6

25 Jul 2022 (E)

(1) C < B < A (2) B < C < A
(3) C < A < B (4) A < C < B

Q108. For the reaction given below:

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CoCl 3 . xNH 3 + AgNO (aq) →

3

If two equivalents of AgCl precipitate out, then the value of x will be ______. 29 Jun 2022 (E)

Q109. Given below are two statements .

Statement I : In CuSO 4 ⋅ 5H 2 O, Cu − O bonds are present.
Statement II : In CuSO 4. 5H 2 O , ligands coordinating with Cu (II) ion are O-and S-based ligands.
In the light of the above statements, choose the correct answer from the options given below
29 Jun 2022 (E)
(1) Both Statement I and Statement II are correct
(2) Both Statement I and Statement II are incorrect
(3) Statement I is correct but Statement II is incorrect
(4) Statement I is incorrect but Statement II is correct

Q110. Spin only magnetic moment of [MnBr 6]

4−
is _____ B.M. (round off to the closest integer) 29 Jun 2022 (E)

Q111. [Fe (CN) 6

]
4−
[Fe (CN) ]
6
3−
[Ti (CN) ]
6
3−
[Ni (CN) ]
4
2−
[Co (CN) ]
6
3−

Among the given complexes, number of paramagnetic complexes is 28 Jun 2022 (E)

Q112. Given below are two statements :

Statement I: [Ni (CN) ]
4
2−
is square planar and diamagnetic complex, with dsp
2
hybridization for Ni but
[Ni (CO) ]
4
is tetrahedral, paramagnetic and with sp hybridication for Ni. 3

Statement II : [NiCl 4 ]
2−
and [Ni (CO) ]
4
both have same d-electron configuration, have same geometry and
are paramagnetic.
In light the above statements, choose the correct answer form the options given below
28 Jun 2022 (M)
(1) Both Statement I and Statement II are true. (2) Statement I is correct but statement II is false.
(3) Statement I is incorrect but statement II is true. (4) Both Statement I and Statement II are false.

Q113. Number of complexes which will exhibit synergic bonding amongst, [Cr (CO) 6
], [Mn (CO) ]
5
and
[Mn 2 (CO)
10
] is 28 Jun 2022 (M)

Q114. (a) CoCl 3. 4 NH 3 , (b) CoCl 3 ⋅ 5 NH 3 , (c) CoCl 3 ⋅ 6 NH 3 and (d) CoCl (NO 3 )2 ⋅ 5 NH 3

Number of complex(es) which will exist in cis-trans form is/are

28 Jun 2022 (E)

Q115. Arrange the following coordination compounds in the increasing order of magnetic moments. (Atomic
numbers: Mn = 25; Fe = 26)
A. [FeF 6]
3−
B. [Fe (CN) 6
]
3−
C. [MnCl 6]
3−
(high spin) D. [Mn (CN) 6
]
3−

Choose the correct answer from the options given below

27 Jun 2022 (E)
(1) A < B < D < C (2) B < D < C < A
(3) A < C < D < B (4) B < D < A < C

Q116. Which of the following will have maximum stabilization due to crystal field? 27 Jun 2022 (M)

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(1) [Ti (H 2 O) 6 ]
3+
(2) [Co (H 2 O) 6 ]
2+

(3) [Co (CN) 6

]
3−
(4) [Cu (NH 3 )4 ]
2+

Q117. The spin-only magnetic moment value of an octahedral complex among CoCl 3 ⋅ 4 NH 3 , NiCl 2 ⋅ 6H 2 O and
PtCl 4 ⋅ 2 HCl , which upon reaction with excess of AgNO gives 2 moles of AgCl is_____B.M. (Nearest 3

Integer) 26 Jun 2022 (M)

Q118. Reaction of [Co (H 2 O) 6 ]

2+
with excess ammonia and in the presence of oxygen results into a diamagnetic
product. Number of electrons present in t -orbitals of the product is 2g 26 Jun 2022 (E)

Q119. White precipitate of AgCl dissolves in aqueous ammonia solution due to formation of 25 Jun 2022 (M)
(1) [Ag (NH 3 )4 ] Cl 2 (2) [Ag (Cl) 2
(NH 3 ) ]
2

(3) [Ag (NH 3 )2 ] Cl (4) [Ag(NH 3) Cl] Cl

Q120. Amongst FeCl 3. 3H 2 O, K 3 [Fe (CN) ]

6
and [Co (NH 3 )6 ] Cl 3 , the spin-only magnetic moment value of the
inner-orbital complex that absorbs light at shortest wavelength is B.M. [nearest integer] 25 Jun 2022 (E)

Q121. If [Cu (H 2 O) ]
4
2+
absorbs a light of wavelength 600 nm for d − d transition, then the value of octahedral
crystal field splitting energy for [Cu (H 2 O) ]
6
2+
will be____×10 −21
J [Nearest integer] (Given:
h = 6. 63 × 10
−34
Js and c = 3. 08 × 10 8
ms
−1
) 25 Jun 2022 (M)

Q122. Match List - I with List - II :

List-II List-II
(A) [PtCl 4 ]
2−
(I) sp
3
d

(B) BrF 5 (II) d

2
sp
3

(C) PCl 5 (III) dsp

2

(D) [Co (NH 3 ) ]

6
3+
(IV) sp
3
d
2

Choose the most appropriate answer from the options given below
24 Jun 2022 (M)
(1) (A) − (II), (B) − (IV), (C) − (I), (D) − (III) (2) (A) − (III), (B) − (IV), (C) − (I), (D) − (II)
(3) (A) − (III), (B) − (I), (C) − (IV), (D) − (II) (4) (A) − (II), (B) − (I), (C) − (IV), (D) − (III)

Q123. Transition metal complex with highest value of crystal field splitting (Δ 0) will be 24 Jun 2022 (E)
(1) [Mo (H 2 O) 6 ]
3+
(2) [Cr (H 2 O) 6 ]
3+

(3) [Os (H 2 O) 6 ]
3+
(4) [Fe (H 2 O) 6 ]
3+

Q124. In the cobalt-carbonyl complex : [Co 2 (CO) ]

8
, number of Co − Co bonds is "X" and terminal CO ligands is
" Y". X + Y =___ 24 Jun 2022 (M)

Q125. The sum of oxidation states of two silver ions in [Ag (NH 3 ) 2 ][Ag(CN) 2 ] complex is _____ . 01 Sep 2021 (E)

Q126. The Crystal Field Stabilization Energy (CFSE) and magnetic moment (spin-only) of an octahedral aqua
complex of a metal ion (M Z+
) are −0. 8Δ and 3. 87 BM, respectively. Identify (M
0
Z+
) : 01 Sep 2021 (E)
(1) V 3+
(2) Co 2
+

(3) Cr 3+
(4) Mn 4+

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Q127. The denticity of an organic ligand, biuret is : 31 Aug 2021 (M)

(1) 2 (2) 3
(3) 4 (4) 6

Q128. Spin only magnetic moment in BM of [Fe (CO) 4

(C 2 O 4 )]
+
is : 31 Aug 2021 (E)
(1) 5. 92 (2) 1
(3) 0 (4) 1. 73

Q129. 1 mol of an octahedral metal complex with formula MCl 3 ⋅ 2 L on reaction with excess of AgNO gives 3

1 mol of AgCl. The denticity of Ligand L is___________ (Integer answer) 27 Aug 2021 (M)

Q130. Acidic ferric chloride solution on treatment with excess of potassium ferrocyanide gives a Prussian blue
coloured colloidal species. It is: 27 Aug 2021 (M)
(1) HFe[Fe(CN) 6] (2) K 5 Fe [Fe(CN) 6 ]
2

(3) Fe 4 [Fe(CN) 6 ]
3
(4) KFe[Fe(CN) 6]

Q131. The number of optical isomers possible for [Cr (C 2 O4 )3 ]

3−
is: 27 Aug 2021 (E)

Q132. The additon of dilute NaOH to Cr 3+

salt solution will give : 27 Aug 2021 (E)
(1) a solution of [Cr(OH) 4]
−
(2) precipitate of [Cr(OH) 6]
3−

(3) precipitate of Cr 2 O 3 (H 2 O)
n
(4) precipitate of Cr(OH) 3

Q133. Which one of the following complexes is violet in colour? 26 Aug 2021 (M)
(1) Fe 4 [Fe(CN) 6 ]
3
⋅ H2 O (2) [Fe(CN) 5 NOS]
4−

(3) [Fe(SCN) 6]
4−
(4) [Fe(CN) 6]
4−

Q134. Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE)
value.
3− 2+ 3+ 3+

Complexes: [CoF 6] , [Co (H 2 O) ]

6
, [Co (NH 3 ) ]
6
and [Co(en) 3 ]
A B C D

Choose the correct option :

26 Aug 2021 (E)
(1) B < C < D < A (2) B < A < C < D
(3) A < B < C < D (4) C < D < B < A

Q135. Indicate the complex/complex ion which did not show any geometrical isomerism : 26 Aug 2021 (E)
(1) [Co (NH 3 )4 Cl 2 ]
+
(2) [Co (NH 3 ) 3 (NO 2 ) 3 ]

(3) [Co(CN) 5 (NC)]

3−
(4) [CoCl 2 (en) 2 ]

Q136. The overall stability constant of the complex ion [Cu (NH 3 )4 ]
2+
is 2. 1 × 10 13
. The overall dissociation
constant is y × 10 −14
. Then y is (Nearest integer) 26 Aug 2021 (E)

Q137. The type of hybridisation and magnetic property of the complex [MnCl 6]
3−
, respectively, are:
27 Jul 2021 (M)
(1) sp 3
d
2
and diamagnetic (2) d 2
sp
3
and diamagnetic
(3) d 2
sp
3
and paramagnetic (4) sp 3
d
2
and paramagnetic

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Q138. Given below are two statements :

Statement I: [Mn(CN) 6]
3−
, [Fe(CN) 6 ]
3−
and [Co (C 2 O4 )3 ]
3−
are d 2
sp
3
hybridised.
Statement II : [MnCl 6]
3−
and [FeF 6]
3−
are paramagnetic and have 4 and 5 unpaired electrons, respectively.
In the light of the above statements, choose the correct answer from the options given below:
27 Jul 2021 (E)
(1) Statement I is correct but statement II is false (2) Both statement I and statement II are false
(3) Statement I is incorrect but statement II is true (4) Both statement I and statement II are are true

Q139. 3 moles of metal complex with formula Co(en) 2 Cl 3 gives 3 moles of silver chloride on treatment with
excess of silver nitrate. The secondary valency of Co in the complex is (Round off to the nearest integer)
27 Jul 2021 (E)

Q140. The number of geometrical isomers found in the metal complexes

[PtCl 2 (NH 3 ) ], [Ni(CO) 4 ], [Ru (H 2 O)
2 3
Cl 3 ] and [CoCl 2 (NH 3 ) ]
4
+
respectively, are: 27 Jul 2021 (M)
(1) 1, 1, 1, 1 (2) 2, 0, 2, 2

(3) 2, 1, 2, 2 (4) 2, 1, 2, 1

Q141. The number of geometrical isomers possible in triamminetrinitrocobalt (III) is X and in trioxalatochromate
(III) is Y. Then the value of X + Y is ____. 27 Jul 2021 (M)

Q142. Three moles of AgCl get precipitated when one mole of an octahedral co-ordination compound with
empirical formula CrCl 3. 3 NH 3 . 3H 2 O reacts with excess of silver nitrate. The number of chloride ions
satisfying the secondary valency of the metal ion is ______ . 25 Jul 2021 (M)

Q143. Which one of the following metal complexes is most stable? 25 Jul 2021 (E)
(1) [Co(en)(NH 3 )4 ] Cl 2 (2) [Co(en) 3] Cl 2

(3) [Co(en) 2 (NH 3 ) 2 ] Cl 2 (4) [Co (NH 3 )6 ] Cl 2

Q144. Which one of the following species responds to an external magnetic field? 25 Jul 2021 (M)
(1) [Fe (H 2 O) 6 ]
3+
(2) [Ni (CN) 4
]
2−

(3) [Co (CN) 6

]
3−
(4) [Ni (CO) 4
]

Q145. The total number of unpaired electrons present in [Co(NH 3 ) 6 ]Cl 2 and [Co(NH 3 ) 6 ]Cl 3 is 22 Jul 2021 (M)

Q146. According to the valence bond theory the hybridization of central metal atom is dsp for which one of the 2

following compounds? 20 Jul 2021 (M)

(1) NiCl 2 ⋅ 6H 2 O (2) K 2 [Ni(CN) 4 ]

(3) [Ni(CO) 4] (4) Na 2 [NiCl 4 ]

Q147. The spin-only magnetic moment value for the complex [Co(CN) 6]
4−
is...... BM. (nearest integer value) [At.
no. of Co = 27] 20 Jul 2021 (M)

Q148. An aqueous solution of NiCl was heated with excess sodium cyanide in presence of strong oxidizing agent
2

to form [Ni(CN) 6]
2−
. The total change in number of unpaired electrons on metal centre is ___________.
20 Jul 2021 (E)

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Q149. Spin only magnetic moment of an octahedral complex of Fe 2+

in the presence of a strong field ligand in BM
is: 20 Jul 2021 (E)
(1) 4. 89 (2) 2. 82
(3) 0 (4) 3. 46

Q150. The correct order of intensity of colors of the compounds is: 20 Jul 2021 (M)
(1) [Ni(CN) 4]
2−
> [NiCl 4 ]
2−
> [Ni (H 2 O) ]
6
2+
(2) [Ni (H 2 O) 6 ]
2+
> [NiCl 4 ]
2−
> [Ni(CN) 4 ]
2−

(3) [NiCl 4]
2−
> [Ni (H 2 O) ]
6
2+
> [Ni(CN) 4 ]
2−
(4) [NiCl 4]
2−
> [Ni(CN) 4 ]
2−
> [Ni (H 2 O) ]
6
2+

Q151. Match List−I with List− II

List−I List− II
(a) Chlorophyll (i) Ruthenium
(b) Vitamin−B 12 (ii) Platinum
(c) Anticancer drug (iii) Cobalt
(d) Grubbs catalyst (iv) Magnesium
Choose the most appropriate answer from the options given below: 18 Mar 2021 (M)
(1) a − iii , b − ii, c − iv, d − i (2) a − iv, b − iii , c − ii, d − i

(3) a − iv, b − iii, c − i, d − ii (4) a − iv, b − ii, c − iii, d − i

Q152. The secondary valency and the number of hydrogen bonded water molecule(s) in CuSO 4 ⋅ 5H 2 O

, respectively, are 18 Mar 2021 (E)

(1) 6 and 4 (2) 4 and 1
(3) 6 and 5 (4) 5 and 1

Q153. The total number of unpaired electrons present in the complex K 3 [Cr(oxalate) 3 ] is______. 18 Mar 2021 (M)

Q154. The correct structures of trans −[NiBr 2

(PPh 3 ) ]
2
and meridional −[Co (NH 3 ) 3 (NO 2 ) 3 ] respectively, are:
18 Mar 2021 (M)
(1) (2)

(3) (4)

Q155. Match List-I with List-II :

List-I List-II
a [Co (NH 3 ) ][Cr(CN) 6 ]
6
i Linkage isomerism
b [Co (NH 3 ) (NO 2 ) ]
3 3
ii Solvate isomerism
c [Cr (H 2 O) ] Cl 3
6
iii Co-ordination isomerism
d cis − [CrCl 2 (ox) 2 ]
3−
iv Optical isomerism
Choose the correct answer from the options given below: 17 Mar 2021 (E)

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(1) (a) − (iii), (b) − (i), (c) − (ii), (d) − (iv) (2) (a )-( iv), (b) − (ii), (c) − (iii), (d) − (i)
(3) (a )-( ii ), ( b )-( i ), ( c )-( iii ), ( d )-( iv) (4) (a) − (i), (b) − (ii), (c) − (iii), (d) − (iv)

Q156. What is the spin-only magnetic moment value (B.M.) of a divalent metal ion with atomic number 25, in
its aqueous solution? 17 Mar 2021 (M)
(1) 5. 92 (2) 5. 0
(3) zero (4) 5. 26

Q157. On complete reaction of FeCl 3 with oxalic acid in aqueous solution containing KOH , resulted in the
formation of product A . The secondary valency of Fe in the product A is ____. (Round off to the Nearest
Integer). 17 Mar 2021 (E)

Q158. [Ti (H 2 O) 6 ]
3+
absorbs light of wavelength 498 nm during a d − d transition. The octahedral splitting energy
for the above complex is _______ ×10 −19
J. (Round off to the Nearest Integer).
h = 6. 626 × 10
−34
Js; c = 3 × 10
8
ms
−1
. 16 Mar 2021 (E)

Q159. The equivalents of ethylene diamine required to replace the neutral ligands from the coordination sphere of
the trans-complex of CoCl 3. 4 NH 3 is _______ . (Round off to the Nearest Integer). 16 Mar 2021 (M)

Q160. Arrange the following metal complex/ compounds in the increasing order of spin only magnetic moment.
Presume all the three, high spin system.
(Atomic numbers Ce = 58, Gd = 64 and Eu = 63.)
(a) (NH 4 ) 2 [Ce (NO 3 ) ]
6
(b) Gd (NO 3 )3 and (c) Eu (NO 3 )3

16 Mar 2021 (E)

(1) (b) < (a) < (c) (2) (c) < (a) < (b)
(3) (a) < (b) < (c) (4) (a) < (c) < (b)

Q161. Number of bridging CO ligands in [Mn 2 (CO)

10
] is 26 Feb 2021 (M)

Q162. The number of stereo isomers possible for [Co (ox) 2

(Br)(NH 3 )]
2−
is __________.
[ox = oxalate]
26 Feb 2021 (E)

Q163. The hybridization and magnetic nature of [Mn (CN) 6

]
4−
and [Fe (CN) 6
]
3−
, respectively are :
25 Feb 2021 (M)
(1) sp 3
d
2
and diamagnetic (2) d 2
sp
3
and paramagnetic
(3) sp 3
d
2
and paramagnetic (4) d 2
sp
3
and diamagnetic

Q164. In which of the following order the given complex ions are arranged correctly with respect to their decreasing
spin only magnetic moment?
(i) [FeF 6]
3−
(ii) [Co (NH 3 )6 ]
3+
(iii) [NiCl 4]
2−
(iv) [Cu (NH 3 )4 ]
2+

25 Feb 2021 (E)

(1) (ii) > (i) > (iii) > (iv) (2) (iii) > (iv) > (ii) > (i)
(3) (i) > (iii) > (iv) > (ii) (4) (ii) > (iii) > (i) > (iv)

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Q165. Given below are two statements:

Statement I : The identification of Ni 2+
is carried out by dimethyl glyoxime in the presence of NH 4 OH .
Statement II :The dimethyl glyoxime is a bidentate neutral ligand.
In the light of the above statements, choose the correct answer from the options given below:
25 Feb 2021 (E)
(1) Statement I is false but Statement II is true. (2) Statement I is true but Statement II is false.
(3) Both Statement I and Statement II are true. (4) Both Statement I and Statement II are false.

Q166. The spin only magnetic moment of a divalent ion in aqueous solution (atomic number 29) is ___ BM.
25 Feb 2021 (E)

Q167. The calculated magnetic moments (spin only value) for species [FeCl 4]
2−
, [Co (C 2 O 4 ) ]
3
3−
and MnO 2−
4

respectively are: 24 Feb 2021 (E)

(1) 4. 90, 0 and 1. 73 BM (2) 4. 90, 0 and 2. 83 BM

(3) 5. 82, 0 and 0 BM (4) 5. 92, 4. 90 and 0 BM

Q168. The species that has a spin-only magnetic moment of 5. 9 BM, is :

(T d = tetrahedral) 06 Sep 2020 (M)
(1) [Ni(CN) 4]
2−
(square planar) (2) [NiCl 4]
2−
(T d )

(3) Ni(CO) 4 (T d ) (4) [MnBr 4]

2−
(T d )

Q169. For a d metal ion in an octahedral field, the correct electronic configuration is :
4
06 Sep 2020 (E)
(1) t 3
2g
e
1
g
when Δ O < P (2) t 3
2g
e
1
g
when Δ O > P

(3) t 4
2g
eg
0
when Δ O < P (4) e 2
g
t
2
2g
when Δ O < P

Q170. The total number of coordination sites in ethylenediaminetetraacetate ( EDTA ) is ........... 4−

05 Sep 2020 (M)

Q171. The values of the crystal field stabilization energies for a high spin d metal ion in octahedral and tetrahedral 6

fields, respectively, are: 05 Sep 2020 (M)

(1) −0 .4 Δ and −0. 6Δ o t (2) −2 .4 Δ and −0. 6 Δ o t

(3) −1 .6 Δ and −0. 4Δ o t (4) −0 .4 Δ and −0 .27 Δ o t

Q172. Considering that Δ 0 > P , the magnetic moment (in BM) of [Ru (H 2 O) 6 ]
2+
would be 05 Sep 2020 (E)

Q173. Consider the complex ions, trans- [Co(en) 2

*
Cl 2 ] (A) and cis − [Co(en) 2 Cl 2 ]
+
(B). The correct
statement regarding them is : 05 Sep 2020 (E)
(1) both (A) and (B) cannot be optically active.
(2) (A) can be optically active, but (B) cannot be optically active.
(3) both (A) and (B) can be optically active.
(4) (A) cannot be optically active, but (B) can be optically active.

Q174. The pair in which both the species have the same magnetic moment (spin only) is: 04 Sep 2020 (M)
(1) [Cr (H 2 O) 6 ]
2+
and [Fe (H 2 O) 6 ]
2+
(2) [Co (OH) 4
]
2–
and [Fe (NH 3 )6 ]
2+

(3) [Mn (H 2 O) 6 ]
2+
and [Cr (H 2 O) 6 ]
2+
(4) [Cr (H 2 O) 6 ]
2+
and [CoCl 4]
2–

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Q175. The Crystal Field Stabilization Energy (CFSE) of [CoF 3

(H 2 O) ](Δ 0 < P)
3
is : 04 Sep 2020 (E)
(1) −0. 8 Δ 0 + 2P (2) −0. 4 Δ 0

(3) −0. 8 Δ 0 (4) −0. 4 Δ 0 + P

Q176. The number of isomers possible for [Pt(en)(NO 2 )2 ] is: 04 Sep 2020 (M)
(1) 2 (2) 4
(3) 1 (4) 3

Q177. The one that can exhibit highest paramagnetic behaviour among the following is : gly = glycinato;
bpy = 2, 2 − ' bipyridine 04 Sep 2020 (E)
(1) [Pd(gly) 2] (2) [Fe(en)(bpy)(NH 3 )2 ]
2*

(3) [Co(OX) 2 (OH) 2 ]

−
(Δ 0 > P) (4) [Ti (NH 3 )6 ]
3*

Q178. Complex A has a composition of H 12 O 6 Cl 3 Cr . If the complex on treatment with conc. H 2 SO 4 loses 13. 5%
of its original mass, the correct molecular formulas of A is:
[Given : atomic mass of Cr = 52 amu and CI = 35 amu] 03 Sep 2020 (E)
(1) [Cr(H 2 O 6 ] Cl 3 (2) [Cr (H 2 O) 3 Cl 3 ] ⋅ 3H 2 O

(3) [Cr (H 2 O) 5 Cl] Cl 2 ⋅ H 2 O (4) [Cr (H 2 O) 4 Cl 2 ]Cl ⋅ 2H 2 O

Q179. The electronic spectrum of [Ti (H 2 O) 6 ]

3+
shows a single broad peak with a maximum at 20, 300 cm −1
.

The crystal field stabilization energy (CFSE) of the complex ion, in kJmol −1
, is : (1 kJmol −1
= 83. 7 cm
−1
)

03 Sep 2020 (M)

(1) 145.5 (2) 242.5
(3) 83.7 (4) 97

Q180. The d-electron configuration of [Ru(en) 3] Cl 2 , and [Fe (H 2 O) 6 ] Cl 2 respectively are: 03 Sep 2020 (E)
(1) t 6
2g
e
0
g
and t
6
2g
e
0
g
(2) t 4
2g
e
2
g
and t
6
2g
e
0
g

(3) t 6
2g
0
e g and t
4
2g
eg
2
(4) t 4
2g
2
e g and t
4
2g
eg
2

Q181. The complex that can show optical activity is : 03 Sep 2020 (M)
(1) trans −[Cr (Cl 2 )(Ox) 2 ]
3−
(2) trans − [Fe (NH 3 ) 2 (CN) 4 ]
−

(3) cis −[Fe (NH 3 ) 2 (CN) 4 ]

−
(4) cis − [CrCl 2 (ox) ]
2
3−
(ox = oxalate)

Q182. The oxidation states of iron atoms in compounds (A), (B) and (C), respectively, are x, y and z. Then sum of
x, y and z is ........... Na 4 [Fe (CN) (NOS)] Na 4 [FeO 4 ] [Fe 2 (CO) ]
5 9
02 Sep 2020 (M)
(A) (B) (C)

Q183. Simplified absorption spectra of three complexes ((i) and (ii) and (iii)) of M
+n
ion are provided below; their
λ max values are marked as A, B and C respectively. The correct match between the complexes and their λ max

values is:

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(i) [M(NCS) 6]
(−6+n)
(ii) [MF 6]
(−6+n)
(iii) [M(NH 3 )6 ]
n+

02 Sep 2020 (E)

(1) A − (iii), (B) − (i), C − (ii) (2) A − (ii), (B) − (i), C − (iii)

(3) A − (ii), (B) − (iii), C − (i) (4) A − (i), (B) − (ii), C − (iii)

Q184. For octahedral Mn(II) and tetrahedral Ni(II) complexes, consider the following statements :
(I) both the complexes can be high spin.
(II) Ni(II) complex can very rarely be of low spin.
(III) with strong field ligands, Mn(II) complexes can be low spin.
(IV) aqueous solution of Mn(II) ions is yellow in color.
The correct statements are :
02 Sep 2020 (M)
(1) (I) and (II) only (2) (I), (II) and (IV) only
(3) (I), (II) and (III) only (4) (II), (III) and (IV) only

Q185. The one that is not expected to show isomerism is: 02 Sep 2020 (E)
(1) [Ni (NH 3 ) 4 (H 2 O) 2 ]
2+
(2) [Ni(en) 3]
2+

(3) [Ni (NH 3 )2 Cl 2 ] (4) [Pt (NH 3 )2 Cl 2 ]

Q186. Consider that d metal ion (M

6 2+
) forms a complex with aqua ligands, and the spin only magnetic moment of
the complex is 4 .90 BM . The geometry and the crystal field stabilization energy of the complex is :
02 Sep 2020 (M)
(1) octahedral and − 2. 4Δ 0 + 2P (2) tetrahedral and −0 .6 Δ t

(3) octahedral and − 1. 6Δ 0 (4) tetrahedral and − 1. 6Δ t + 1P

Q187. Complex X Of composition Cr(H 2 O) 6 Cl n Has a spin only magnetic moment of 3.83 B. M. It reacts with
AgNO
3
And shows geometrical isomerism. The IUPAC nomenclature of X Is: 09 Jan 2020 (M)
(1) Hexaaqua chromium(III) chloride
(2) Tetraaquadichlorido chromium(IV) chloride dihydrate
(3) Dichloridotetraaqua chromium(IV) chloride dihydrate
(4) Tetraaquadichlorido chromium(III) chloride dihydrate

Q188. The correct order of the spin-only magnetic moments of the following complexes is:
(I) [Cr(H 2 O) ]Br 2 (II) Na 4 [Fe(CN) ] (III) Na 3 [Fe(C 2 O 4 ) ](Δ 0 > P) (IV) (Et 4 N) [CoCl 4 ]
6 6 3 2

09 Jan 2020 (E)

(1) (III) > (I) > (IV) > (II) (2) (III) > (I) > (II) > (IV)
(3) (I) > (IV) > (III) > (II) (4) (II) ≈ (I) > (IV) > (III)

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Q189. [Pd(F)(Cl)(Br)(I)] 2−
has n number of geometrical isomers. Then, the spin-only magnetic moment and
crystal field stabilization energy [CFSE] of [Fe(CN) 6
]
n−6
, respectively, are:
[Note: Ignore the pairing energy] 09 Jan 2020 (M)
(1) 2.84 BM and −16Δ 0 (2) 5.92 BM and 0
(3) 1.73 BM and −2.0Δ 0 (4) 0 BM and −2.4Δ 0

Q190. The isomer(s) of [Co(NH 3 ) 4 Cl 2 ] that has/ have a Cl − Co − Cl angle of 90 , is/are: o

09 Jan 2020 (E)
(1) meridional and trans (2) cis and trans
(3) trans only (4) cis only

Q191. The complex that can show f ac - and mer -isomers is: 08 Jan 2020 (M)
(1) [Co(NH 3 ) 4 Cl 2 ]
+
(2) [Pt(NH 3 ) 2 Cl 2 ]

(3) [CoCl 2 (en) 2 ] (4) [Co(NH 3 ) 3 (NO 2 ) 3 ]

Q192. Among (a) − (d), the complexes that can show geometrical isomerism are:
+ − 2+
(a) [P t(N H 3 ) Cl] (b) [P t(N H 3 )Cl 5 ] (c) [P t(N H 3 ) Cl(N O 2 )] (d) [P t(N H 3 ) ClBr]
3 2 4

08 Jan 2020 (E)

(1) b and c (2) d and a
(3) c and d (4) a and b

Q193. Complexes (M L 5) of metals N i and F e have ideal square pyramidal and trigonal bipyramidal geometries,
respectively. The sum of the 90 o
, 120
o
and 180 o
L − M − L angles in the two complexes is_______
08 Jan 2020 (E)

Q194. The correct order of the calculated spin-only magnetic moments of complexes (A) to (D) is:
(A) N i(CO)
4
(B) [N i(H 2 O) ]Cl 2
6
(C) N a 2 [N i(CN ) ]
4
(D) P dCl 2 (P P h 3 )
2
08 Jan 2020 (E)
(1) (A) ≈ (C) < (B) ≈ (D) (2) (C) < (D) < (B) < (A)
(3) (C) ≈ (D) < (B) < (A) (4) (A) ≈ (C) ≈ (D) < (B)

Q195. The IUPAC name of the complex [Pt(NH 3 ) 2 Cl(NH 2 CH 3 )]Cl is 07 Jan 2020 (M)
(1) Diamminechlorido (methanamine) platinum (II) chloride
(2) Diammine(methanamine)chlorido platinum (II) chloride
(3) Diamminechlorido (aminomethane) platinum (II) chloride
(4) Bisammine (methanamine) chlorido platinum (II) chloride

Q196. The theory that can completely/properly explain the nature of bonding in [Ni (CO) ] is: 4
07 Jan 2020 (M)
(1) Werner's theory (2) Molecular orbital theory
(3) Crystal field theory (4) Valence bond theory

Q197. Among the statements (a) − (d) , the incorrect ones are:
(a) Octahedral Co(III) complexes with strong field ligands have very high magnetic moments
(b) When Δ 0 < P , the d-electron configuration of Co(III) in an octahedral complex is t 4
eg
e
2
g

(c) Wavelength of light absorbed by [Co(en) 3

]
3+
is lower than that of [CoF 6]
3−

(d) If the Δ for an octahedral complex of Co(III) is 18,000cm , the Δ for its tetrahedral complex with the
0
−1
t

same ligand will be 16,000cm . −1

07 Jan 2020 (E)

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(1) (a) and (d) only (2) (c) and (d) only
(3) (a) and (b) only (4) (b) and (c) only

Q198. The number of possible optical isomers for the complexes MA 2 B2 with sp and dsp hybridized metal atom,
3 2

respectively, is:
Note: A and B are unidentate neutral and unidentate monoanionic ligands, respectively. 07 Jan 2020 (E)
(1) 0 and 2 (2) 2 and 2
(3) 0 and 0 (4) 0 and 1

Q199. The coordination numbers of Co and Al in [Co(Cl)(en) 2

]Cl and K 3 [Al(C 2 O 4 ) 3 ], respectively are:
(en = ethane-1, 2-diamine) 12 Apr 2019 (E)
(1) 3 and 3 (2) 5 and 3
(3) 5 and 6 (4) 6 and 6

Q200. The compound used in the treatment of lead poisoning is: 12 Apr 2019 (E)
(1) Desferrioxime B (2) EDTA
(3) Cis-platin (4) D−penicillamine

Q201. Complete removal of both the axial ligands (along the z − axis ) from an octahedral complex leads to which
of the following splitting patterns? (relative orbital energies not on scale). 12 Apr 2019 (M)
(1) (2)

(3) (4)

Q202. The complex ion that will lose its crystal field stabilization energy upon oxidation
of metal to +3 state is:

12 Apr 2019 (M)

(1) [Ni (phen) 3
]
2+
(2) [Fe(phen) 3
]
2+

(3) [Co(phen) 3
]
2+
(4) [Zn (phen) 3
]
2+

Q203. The incorrect statement is. 10 Apr 2019 (E)

(1) The spin-only magnetic moments of [Fe(H 2 O) 6 ]
2+
and [Cr(H 2 O) 6 ]
2+
are nearly similar.
(2) The spin-only magnetic moment of [Ni(NH 3 ) 4 (H 2 O) 2 ]
2+
is 2.83 BM.
(3) The gemstone, ruby, has Cr 3+
ions occupying the octahedral sites of beryl.
(4) The color of [CoCl(NH 3 )5 ]
2+
is violet as it absorbs the yellow light.

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Q204. Three complexes,

[CoCl(NH 3 ) ]
5
2+
(I), [Co(NH 3 ) H 2 O]
5
3+
(II) and [Co(NH 3 )6 ]
3+
(III)

absorb light in the visible region. The correct order of the wavelength of light absorbed by them is:
10 Apr 2019 (M)
(1) (II) > (I) > (III) (2) (III) > (II) > (I)
(3) (I) > (II) > (III) (4) (III) > (I) > (II)

Q205. The crystal field stabilization energy (CFSE) of [Fe(H 2 O) 6 ]Cl 2 and K 2 [NiCl 4 ], respectively, are:
10 Apr 2019 (E)
(1) −0.4 Δ 0 and −1.2Δ t (2) −2.4Δ and −1.2Δ 0 t

(3) −0.4Δ and −0.8Δ0 t (4) −0.6Δ and −0.8Δ 0 t

Q206. The species that can have a trans-isomer is:

(en = ethane − 1, 2 − diamine, ox = oxalate) 10 Apr 2019 (M)
(1) [Cr(en) 2
(ox)]
+
(2) [Pt(en)Cl 2]

(3) [Zn(en)Cl 2] (4) [Pt(en) 2

Cl 2 ]
2+

Q207. The correct statements among I to III are:

(I) Valence bond theory cannot explain the color exhibited by transition metal complexes.
(II) Valence bond theory can predict quantitatively the magnetic properties of transition metal complexes.
(III) Valence bond theory cannot distinguish ligands as weak and strong field ones. 09 Apr 2019 (E)
(1) (I) and (II) only (2) (II) and (III) only
(3) (I) and (III) only (4) (I), (II) and (III)

Q208. The maximum possible denticities of a ligand given below towards a common transition and inner-transition
metal ion, respectively, are:
09 Apr 2019 (E)

(1) 8 and 6 (2) 6 and 6

(3) 8 and 8 (4) 6 and 8

Q209. The degenerate orbitals of [Cr(H 2 O) 6 ]

3+
are 09 Apr 2019 (M)
(1) d 2
x −y
2 and d xy . (2) d z
2 and d xz .
(3) d yz and d z 2 . (4) d xz and d yz .

Q210. The one that will show optical activity is

(en =ethane−1, 2− diamine) 09 Apr 2019 (M)

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(1) (2)

(3) (4)

Q211. The calculated spin-only magnetic moments (BM) of the anionic and cationic species of [Fe(H 2 O) 6 ]
+2
and
[Fe (CN) ]
6
4−
respectively, are: 08 Apr 2019 (E)
(1) 0 and 4.9 (2) 2.84 and 5.92
(3) 4.9 and 0 (4) 0 and 5.92

Q212. The following ligand is:

08 Apr 2019 (M)

(1) tridentate (2) hex dentate

(3) bidentate (4) tetradentate

Q213. The compound that inhibits the growth of tumors is: 08 Apr 2019 (E)
(1) trans − [Pt(Cl) 2
(NH 3 ) ]
2
(2) cis − [Pt(Cl) (NH 3 ) ]
2 2

(3) cis − [Pd(Cl) (NH 3 ) ]

2 2
(4) trans − [Pd(Cl) 2
(NH 3 ) ]
2

Q214. The correct order of the spin –only magnetic moment of metal ions in the following low-spin complexes,
[V(CN) ]
6
4−
, [Fe(CN) ]
6
4−
, [Ru(NH 3 ) ]
6
3+
and [Cr(NH 3
) ]
6
2+
, is: 08 Apr 2019 (M)
(1) 2
V + > Cr
2+
> Ru
3+
> Fe
2+
(2) Cr 2+
> V + > Ru
2 3+
> Fe
2+

(3) Cr 2+
> Ru
3+
> Fe
2+
> V
2+
(4) V 2+
> Ru
3+
> Cr
2+
> Fe
2+

Q215. The pair of metal ions that can give a spin only magnetic moment of 3.9 BM for the complex [M (H 2
O) ]Cl 2
6

, is: 12 Jan 2019 (M)

(1) Co 2+
and F e 2+
(2) V 2+
and F e 2+

(3) Cr 2+
and M n 2+
(4) V 2+
and Co 2+

Q216. The metal's d− orbitals that are directly facing the ligands in K 3
[Co(CN ) ]
6
are: 12 Jan 2019 (M)
(1) d xy
, d xz and d yz
(2) d x −y
2 2 and d z
2

(3) d xy and d x −y
2 2 (4) d xz , d yz and d z
2

Q217. The magnetic moment of an octahedral homoleptic Mn(II) complex is 5 .9 B. M. . The suitable ligand for
this complex is: 12 Jan 2019 (E)
(1) CN −
(2) CO
(3) Ethylenediamine (4) N CS −

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Q218. M n 2 (CO) 10 is an organometallic compound due to the presence of: 12 Jan 2019 (M)
(1) M n − O bond (2) M n − M n bond
(3) C − O bond (4) M n − C bond

Q219. The coordination number of Th in K 4 [Th(C 2 O 4 ) (H 2 O) ]

4 2
is:
(C 2 O
2−

4
= oxalato ) 11 Jan 2019 (E)
(1) 14 (2) 6
(3) 8 (4) 10

Q220. Match the metals (column I) with the coordination compound(s)/enzyme(s) (column II) :
11 Jan 2019 (M)

(1) (A)-(iii); (B)-(iv); (C)-(i); (D)-(ii) (2) (A)-(i); (B)-(ii); (C)-(iii); (D)-(iv)
(3) (A)-(ii); (B)-(i); (C)-(iv); (D)-(iii) (4) (A)-(iv); (B)-(iii); (C)-(i); (D)-(ii)

Q221. The number of bridging CO ligand(s) and Co-Co bond(s) in Co 2 (CO) 8 , respectively are: 11 Jan 2019 (E)
(1) 2 and 1 (2) 2 and 0
(3) 0 and 2 (4) 4 and 0

Q222. Wilkinson catalyst is 10 Jan 2019 (M)

(1) [(Et 3 P)
3
IrCl] (Et = C 2 H 5 ) (2) [(Ph 3 P)
3
RhCl]

(3) [(Ph 3 P)
3
IrCl] (4) [(Et 3 P)
3
RhCl]

Q223. The difference in the number of unpaired electrons of a metal ion in its high-spin and low-spin octahedral
complexes is two. The metal ion is: 10 Jan 2019 (E)
(1) Fe 2+
(2) Co 2+

(3) Ni 2+
(4) Mn 2+

Q224. The total number of isomers for a square planar complex: [MCl(F)(NO 2 )(SCN)] is: 10 Jan 2019 (M)
(1) 12 (2) 16
(3) 4 (4) 8

Q225. A reaction of cobalt (III) chloride and ethylenediamine in a 1 : 2 mole ratio generates two isomeric products
A (violet-coloured) and B (green-coloured). A can show optical activity, but, B is optically inactive. What
type of isomers do A and B represent? 10 Jan 2019 (E)
(1) Coordination isomers (2) Linkage isomers
(3) Ionisation isomers (4) Geometrical isomers

Q226. Homoleptic octahedral complexes of a metal ion ′M 3+

′ with three monodentate ligands L 1, L 2 and L 3

absorb wavelengths in the region of green, blue and red respectively. The increasing order of the ligand
strength is: 09 Jan 2019 (E)

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(1) L 3 > L1 > L2 . (2) L 1 > L2 > L3 .

(3) L 2 > L1 > L3 . (4) L 3 > L2 > L1 .

Q227. The complex that has highest crystal field splitting energy (Δ) , is: 09 Jan 2019 (E)
(1) K 3 [Co(CN ) 6 ] (2) [Co(N H 3 ) 5 Cl ] Cl 2

(3) [Co(N H 3 ) 5 (H 2 O)]Cl 3 (4) K 2 [CoCl 4 ]

Q228. Two complexes [Cr (H 2 O) 6 ] Cl 3 (A) and [Cr (NH 3 )6 ] Cl 3 (B) are violet and yellow coloured, respectively,
The incorrect statement regarding them is: 09 Jan 2019 (M)
(1) Both are paramagnetic with three unpaired electrons
(2) Δ value of (A) is less than that of (B)
0

(3) Δ values of (A) and (B) are calculated from the energies violet and yellow light, respectively.
0

(4) Both absorb energies corresponding to their complementary colors.

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ANSWER KEYS
1. (4) 2. (3) 3. (2) 4. (1) 5. (3) 6. (1) 7. (2) 8. (2)
9. (2) 10. (2) 11. (3) 12. (4) 13. (4) 14. (3) 15. (2) 16. (3)
17. (2) 18. (3) 19. (2) 20. (3) 21. (1) 22. (3) 23. (1) 24. (1)
25. (2) 26. (2) 27. (4) 28. (4) 29. (4) 30. (3) 31. (3) 32. (4)
33. (1) 34. (1) 35. (2) 36. (1) 37. (4) 38. (4) 39. (3) 40. (1)
41. (0) 42. (4) 43. (1) 44. (2) 45. (2) 46. (4) 47. (1) 48. (4)
49. (2) 50. (1) 51. (3) 52. (1) 53. (4) 54. (1) 55. (2) 56. (1)
57. (4) 58. (1) 59. (1) 60. (3) 61. (3) 62. (4) 63. (10) 64. (3)
65. (3) 66. (1) 67. (4) 68. (4) 69. (3) 70. (1) 71. (1) 72. (6)
73. (3) 74. (3) 75. (1) 76. (480) 77. (2) 78. (4) 79. (1) 80. (2)
81. (2) 82. (1) 83. (4) 84. (0) 85. (1) 86. (2) 87. (5) 88. (4)
89. (2) 90. (4) 91. (7) 92. (3) 93. (1) 94. (9) 95. (2) 96. (1)
97. (2) 98. (3) 99. (3) 100. (4) 101. (1) 102. (2) 103. (0) 104. (1)
105. (4) 106. (0) 107. (1) 108. (5) 109. (3) 110. (6) 111. (2) 112. (4)
113. (3) 114. (1) 115. (2) 116. (3) 117. (3) 118. (6) 119. (3) 120. (2)
121. (766) 122. (2) 123. (3) 124. (7) 125. (2) 126. (2) 127. (1) 128. (4)
129. (2) 130. (4) 131. (2) 132. (3) 133. (2) 134. (2) 135. (3) 136. (5)
137. (4) 138. (4) 139. (6) 140. (2) 141. (2) 142. (0) 143. (2) 144. (1)
145. (1) 146. (2) 147. (2) 148. (2) 149. (3) 150. (3) 151. (2) 152. (2)
153. (3) 154. (4) 155. (1) 156. (1) 157. (6) 158. (4) 159. (2) 160. (4)
161. (0) 162. (3) 163. (2) 164. (3) 165. (2) 166. (2) 167. (1) 168. (4)
169. (1) 170. (6) 171. (1) 172. (0) 173. (4) 174. (1) 175. (2) 176. (4)
177. (3) 178. (4) 179. (4) 180. (3) 181. (4) 182. (6) 183. (1) 184. (3)
185. (3) 186. (2) 187. (4) 188. (3) 189. (3) 190. (4) 191. (4) 192. (3)
193. (20) 194. (4) 195. (1) 196. (2) 197. (1) 198. (3) 199. (3) 200. (2)
201. (4) 202. (2) 203. (3) 204. (3) 205. (3) 206. (4) 207. (1) 208. (4)
209. (4) 210. (3) 211. (1) 212. (4) 213. (2) 214. (1) 215. (4) 216. (2)
217. (4) 218. (4) 219. (4) 220. (1) 221. (1) 222. (2) 223. (2) 224. (1)
225. (4) 226. (3) 227. (1) 228. (3)

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