Gadar 3.
0 : JEE 2025 DPP - 6
Chemistry
Coordination Compounds
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Gadar 3.0 : JEE 2025 DPP - 6 | Q1
If Ni2+ is replaced by Pt2+ in the complex [NiCl2Br2]2-, which of
the following properties are expected to get changed ?
A. Geometry B. Geometrical isomerism
C. Optical isomerism D. Magnetic properties
A A, B and C
B A, B and D
C A and D
D B and C
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Gadar 3.0 : JEE 2025 DPP - 6 | Q2
The correct order of the number of unpaired electrons in
the given complexes is
A [Fe(CN)6]3-
B [FeF6]3-
C [CoF6]3-
D [Cr(oxalate)3]3-
E [Ni(CO)4]
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Gadar 3.0 : JEE 2025 DPP - 6 | Q3
Which of the following complex is octahedral,
diamagnetic and the most stable ?
A Na3 [CoCl6]
B [Ni(NH3)6]Cl2
C K3[Co(CN)6]
D [Co(H2O)6]Cl2
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Gadar 3.0 : JEE 2025 DPP - 6 | Q4
A solution of FeCl3 when treated with K4 [Fe(CN)6] gives
a prussian blue precipitate due to the formation of
A K [Fe2(CN)6]
B Fe[Fe(CN)6]
C Fe3[Fe(CN)6]2
D Fe4[Fe(CN)6]3
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Gadar 3.0 : JEE 2025 DPP - 6 | Q5
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
A X = [Co(H2O)6]2+ , Y = [CoCl4]2- , Z = Tetrahedral
B X = [Co(H2O6)]2+ , Y = [CoCl6]3- , Z = Octahedral
C X = [co(H2O)6]3+ , Y = [CoCl6]3- , Z = Octahedral
D X = [co(H2O)4Cl2]+ , Y = [CoCl4]2- , Z = Tetrahedral
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Gadar 3.0 : JEE 2025 DPP - 6 | Q6
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 :
A B and D only
B C and D only
C A and B only
D A and C only
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Gadar 3.0 : JEE 2025 DPP - 6 | Q7
Correct order of spin only magnetic moment of the
following complex ions is :
(Given At. No. Fe : 26, Co : 27)
A [FeF6]3- > [CoF6]3- > [Co(C2O4)3]3-
B [Co(C2O4)3]3- > [CoF6]3- < [FeF6]3-
C [FeF6]3- < [CoF3]3- < [Co(C2O4)6]3-
D [Co(C2O4)3]3- < [CoF6]3- <[Fe2F3]3-
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Gadar 3.0 : JEE 2025 DPP - 6 | Q8
Which of the following cannot be explained by crystal
field theory ?
A The order of spectrochemical series
B Magnetic properties of transition metal complexes
C Colour of metal complexes
D Stability of metal complexes
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Gadar 3.0 : JEE 2025 DPP - 6 | Q9
Octahedral complexes of copper (II) undergo structural
distortion (Jahn-Teller). Which one of the given copper (II)
complexes will shows the maximum structural distortion ?
(en-ethylenediamine, H2N - CH2 CH2 - NH2)
A [Cu(H2O)6]SO4
B [Cu(en)(H2O)4]SO4
C cis-[Cu(en)2Cl2]
D trans-[Cu(en)2Cl2]
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Gadar 3.0 : JEE 2025 DPP - 6 | Q10
Statement I : In CuSO4 . 5H2O, Cu-O bonds are
present.
Statement II : In CuSO4 . 5H2O, ligands coordinating
with Cu(II) ion are O-and S-based ligands.
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Gadar 3.0 : JEE 2025 DPP - 6 | Q11
Match List - I with List - II :
List - I List - II
A [Co(NH3)6] [Cr(CN)6] (i) Linkage isomerism
B [Co(NH3)3(NO2)3] (ii) Solvate isomerism
C [Cr(H2O)6Cl3 (iii) Co-ordination isomerism
D cis - [CrCl2(ox)2]3- (iv) Optical isomerism
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Gadar 3.0 : JEE 2025 DPP - 6 | Q12
Simplified absorption spectra of three complexes (i), (ii)
and (iii) of n Mn+ ion are provided below, their 𝛌max values
are marked as A, B and C respectively. The correct match
between the complexes and their 𝛌max values is :
A [M(NCS)6](-6+n)
B [MF6](-6+n)
C [M(NH3)6]n+
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Gadar 3.0 : JEE 2025 DPP - 6 | Q13
The maximum possible denticities of a ligand given
below towards a common transition and inner -transition
metal ion, respectively, are :
A 6 and 6
B 8 and 8
C 8 and 6
D 6 and 8
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Gadar 3.0 : JEE 2025 DPP - 6 | Q14
Consider the following metal complexes:
[Co(NH3)6]3+
[CoCl(NH3)5]2+
[Co(CN)6]3-
[Co(NH3)5(H2O)]3+
The spin-only magnetic moment value of the complex
that absorbs light with shortest wavelength is _____
B.M. (Nearest Integer)
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Gadar 3.0 : JEE 2025 DPP - 6 | Q15
Assertion A: In the complex Ni(CO)4 and Fe(CO)5, the metals have
zero oxidation state.
Reason R: Low oxidation states are found when a complex has
ligands capable of n-donor character in addition to the o-bonding.
A A is not correct but R is correct
B A is correct but R is not correct
Both A and R are correct but R is NOT the correct
C explanation of A
D Both A and R are correct and R is the correct
explanation of A
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Gadar 3.0 : JEE 2025 DPP - 6 | Q16
The number of bridging CO ligand (s) and Co-Co
bond(s) in CO2 (CO)8, respectively are :
A 0 and 2
B 4 and 0
C 2 and 1
D 2 and 0
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Gadar 3.0 : JEE 2025 DPP - 6 | Q17
Assertion A: [CoCI(NH3)5]2+ absorbs at lower wavelength of
light with respect to [Co(NH3)5 (H2O)]3+
Reason R: It is because the wavelength of the light
absorbed depends on the oxidation state of the metal ion.
A A is false but R. is true
B Both A and R are true but R. is NOT the correct
explanation of A
C Both A and R are true and R is the correct explanation
of A
D A is true but R is false
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Gadar 3.0 : JEE 2025 DPP - 6 | Q18
The number of isomers possible for [Pt(en)(NO2)2] is :
A 3
B 2
C 1
D 4
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Gadar 3.0 : JEE 2025 DPP - 6 | Q19
Arrange the following metal complex/compounds in the
increase order of spin only magnetic moment. Presume all the
three, high spin system.
(Atomic numbers Ce = 58, Gd = 64 and Eu = 63).
(A) (NH4)2 [Ce(NO3)6] (B) Gd(NO3)3 and (C) Eu(NO3)3
A (B) < (A) < (C)
B (A) < (C) < (B)
C (C) < (A) < (B)
D (A) < (B) < (C)
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Gadar 3.0 : JEE 2025 DPP - 6 | Q20
Which one of the following metal complexes is most
stable?
A [Co(en)(NH3)4]Cl2
B [Co(en)3]Cl2
C [Co(en)2(NH3)2]Cl2
D [Co(NH3)6]Cl2
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Gadar 3.0 : JEE 2025 Answer Key
Ques. No. Answer Ques. No. Answer
1 B 11 -
2 E 12 -
Join HP Gurukul 3 C 13 D
4 D 14 0
Click Here 5 A 15 B
6 A 16 C
7 A 17 A
8 A 18 A
9 A 19 B
10 - 20 B
Gadar 3.0 : JEE 2025 DPP - 6 | Q1
Solution:
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Gadar 3.0 : JEE 2025 DPP - 6 | Q2
Solution: E<A<D<C<B
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Gadar 3.0 : JEE 2025 DPP - 6 | Q3
Solution:
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Gadar 3.0 : JEE 2025 DPP - 6 | Q4
Solution:
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Gadar 3.0 : JEE 2025 DPP - 6 | Q5
Solution:
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Gadar 3.0 : JEE 2025 DPP - 6 | Q6
Solution:
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Gadar 3.0 : JEE 2025 DPP - 6 | Q7
Solution:
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Gadar 3.0 : JEE 2025 DPP - 6 | Q8
Solution:
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Gadar 3.0 : JEE 2025 DPP - 6 | Q9
Solution:
According to John teller any nonlinear molecular system
in a degenerate electronic state will be unstable and will
undergo some kind of distortion which will lower its
symmetry and energy and split the degenerate state.
In case of octahedral d9 configuration, the last electron
may occupy either
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Gadar 3.0 : JEE 2025 DPP - 6 | Q9
Solution:
If it occupies dz2 orbital most of the electron density will
be concentrated between the metal and the two ligands
on the z axis. Thus there will be greater electrostatic
repulsion associated with these ligands than with the
other four on xy plane.
The Jahn Teller effect is mostly observed in octahedral
environments. The considerable distortions are usually
observed in high spin d4, low spin d7 and d9
configuration.
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Gadar 3.0 : JEE 2025 DPP - 6 | Q10
Solution:
Statement I is true but statement II is false. Only oxygen
atom forms a Co-ordinate bond with Cu+2 in
CuSO4.5H2O
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Gadar 3.0 : JEE 2025 DPP - 6 | Q11
Solution:
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Gadar 3.0 : JEE 2025 DPP - 6 | Q12
Solution:
Stronger the ligand greater is splitting of d orbitals and
smaller will be wavelength of light absorbed.
The splitting of ligand is F- < NCS- < NH3
So order of wavelength of light absorbed is
(λmax)NH3 <(λmax)NCS- < (λmax)F-
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Gadar 3.0 : JEE 2025 DPP - 6 | Q13
Solution:
General C.No. of CN– in transition elements is 6 and in
inner transition elements is 8 – 12.
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Gadar 3.0 : JEE 2025 DPP - 6 | Q14
Solution:
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Gadar 3.0 : JEE 2025 DPP - 6 | Q15
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Gadar 3.0 : JEE 2025 DPP - 6 | Q16
Solution:
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Gadar 3.0 : JEE 2025 DPP - 6 | Q17
Solution:
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Gadar 3.0 : JEE 2025 DPP - 6 | Q18
Solution:
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Gadar 3.0 : JEE 2025 DPP - 6 | Q19
Solution:
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Gadar 3.0 : JEE 2025 DPP - 6 | Q20
Solution:
For a complex having same central metal ion and
coordination number, stability increase with the increase
in the strength of the ligand. The order of strength is: en
> NH3.
Thus, among the given complexes, the most stable
would be [Co(en)3]Cl2. Also the compound has 3 chelate
rings.
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Gadar 3.0 : JEE 2025 DPP - 61
All the Best.
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