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Coordination Compounds · Question 33

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

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 .

Answer

7

Solution

= n(n+2) BM; > 3.0 BM needs n 3 (n = 2 gives 2.83 BM)

Co2+: 3d7 ⇒ n = 3, = 3.87 BM

Ni2+: 3d8 ⇒ n = 2, = 2.83 BM

Fe2+: 3d6 ⇒ n = 4, = 4.90 BM

V3+: 3d2 ⇒ n = 2, = 2.83 BM

Ti2+: 3d2 ⇒ n = 2, = 2.83 BM

Ions with > 3.0 BM: Co2+ and Fe2+

High spin octahedral (weak field):

Co2+ ( t2g5 eg2) ⇒ 3 unpaired electrons

Fe2+ ( t2g4 eg2) ⇒ 4 unpaired electrons

Sum = 3 + 4 = 7

Answer: 7

JEE Main 2026 (Online) 21st January Evening Shift

Keep practising — Coordination Compounds

2

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
3

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
4

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
5

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
6

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
7

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
8

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
9

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
10

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
11

Number of stereoisomers possible for the complexes, [CrCl3(py)3] and [CrCl2(ox)2]3- are respectively (py = pyridine, ox = oxalate)

  1. 3 & 3
  2. 2 & 3
  3. 1 & 2
  4. 2 & 2
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