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Coordination Compounds · Question 32

JEE Main 2026 (Online) 21st January Evening ShiftMCQMedium📈 Topic in 55% papers+4−1
1

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

  1. Statement I is true but Statement II is false
  2. Both Statement I and Statement II are true
  3. Both Statement I and Statement II are false
  4. Statement I is false but Statement II is true

Answer

(2) Both Statement I and Statement II are true

Solution

Statement I: H2O is a weak field ligand ( o < P), so both complexes are high spin.

Cr2+ (3d4): t2g3eg1 CFSE = 3(-0.4 o) + 1(0.6 o) = -0.6 o

Mn2+ (3d5): t2g3eg2 CFSE = 3(-0.4 o) + 2(0.6 o) = 0

CFSE (magnitude) of the Cr(II) complex is greater. Statement I is true.

Statement II: CN- is a strong field ligand (low spin).

K3[Fe(CN)6]: Fe3+ (3d5) t2g5, n = 1 = 1(1+2) = 1.73 BM

Na4[Fe(CN)6]: Fe2+ (3d6) t2g6, n = 0 = 0

Statement II is true.

Answer: (2)

JEE Main 2026 (Online) 21st January Evening Shift

Keep practising — Coordination Compounds

2

Identify the metal ions among Co2+, Ni2+, Fe2+, V3+ and Ti2+ having a spin-only magnetic moment value more than 3.0 BM. The sum of unpaired electrons present in the high spin octahedral complexes formed by those metal ions is .

JEE Main 2026 (Online) 21st January Evening Shift
3

Match the LIST-I with LIST-II Choose the correct answer from the options given below:

  1. A-I, B-II, C-III, D-IV
  2. A-IV, B-I, C-III, D-II
  3. A-III, B-II, C-I, D-IV
  4. A-III, B-IV, C-II, D-I
JEE Main 2025 (Online) 8th April Evening Shift
4

The number of species from the following that are involved in sp3d2 hybridization is : [Co(NH3)6]3+, SF6, [CrF6]3-, [CoF6]3-, [Mn(CN)6]3-, and [MnCl6]3-

  1. 4
  2. 3
  3. 5
  4. 6
JEE Main 2025 (Online) 8th April Evening Shift
5

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below:

  1. Statement I is true but Statement II is false
  2. Both Statement I and Statement II are true
  3. Both Statement I and Statement II are false
  4. Statement I is false but Statement II is true
JEE Main 2025 (Online) 8th April Evening Shift
6

An octahedral complex having molecular composition Co 5NH3 Cl SO4 has two isomers A and B. The solution of A gives a white precipitate with AgNO3 solution and the solution of B gives white precipitate with BaCl2 solution. The type of isomerism exhibited by the complex is,

  1. Co-ordinate isomerism
  2. Ionisation isomerism
  3. Geometrical isomerism
  4. Linkage isomerism
JEE Main 2025 (Online) 7th April Morning Shift
7

The number of paramagnetic complexes among [FeF6]3-, [Fe(CN)6]3-, [Mn(CN)6]3-, [Co(C2O4)3]3-, [MnCl6]3-, and [CoF6]3-, which involve d2sp3 hybridization is .

JEE Main 2025 (Online) 7th April Morning Shift
8

Match List - I with List - II. Choose the correct answer from the options given below :

  1. A-I, B-III, C-II, D-IV
  2. A-II, B-III, C-IV, D-I
  3. A-I, B-IV, C-IV, D-III
  4. A-III, B-I, C-II, D-IV
JEE Main 2025 (Online) 7th April Evening Shift
9

The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively : [Fe(CN)6]3-, [FeF6]3-, [CoF6]3-, [Mn(CN)6]3-

  1. 1, 5, 4, 2
  2. 1, 4, 4, 2
  3. 1, 5, 5, 2
  4. 1, 1, 4, 2
JEE Main 2025 (Online) 7th April Evening Shift
10

The number of paramagnetic metal complex species among [Co(NH3)6]3+, [Co(C2O4)3]3-, [MnCl6]3-, [Mn(CN)6]3-, [CoF6]3-, [Fe(CN)6]3- and [FeF6]3- with same number of unpaired electrons is .

JEE Main 2025 (Online) 7th April Evening Shift
11

Which one of the following complexes will have o = 0 and = 5.96 B.M.?

  1. [FeF6]4-
  2. [Mn(SCN)6]4-
  3. [Co(NH3)6]3+
  4. [Fe(CN)6]4-
JEE Main 2025 (Online) 4th April Morning Shift

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