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Coordination Compounds

JEE Main 2025 (Online) 22nd January Morning ShiftMCQMedium📈 Topic in 37% papers+4−1
Ques. 1JEE Main 2025, 22 January (Morning Shift)

From the magnetic behaviour of [NiCl4]2- (paramagnetic) and [Ni(CO)4] (diamagnetic), choose the correct geometry and oxidation state.

  1. [NiCl4]2- : Ni(0), tetrahedral [Ni(CO)4] : Ni(0), square planar
  2. [NiCl4]2- : NiII, tetrahedral [Ni(CO)4] : Ni(0), tetrahedral
  3. [NiCl4]2- : NiII, tetrahedral [Ni(CO)4] : NiII, square planar
  4. [NiCl4]2- : NiII, square planar [Ni(CO)4] : Ni(0), square planar

Answer

(2) [NiCl4]2- : NiII, tetrahedral [Ni(CO)4] : Ni(0), tetrahedral

Solution

[NiCl4]2-: Ni2+, 3d8; weak-field Cl- no pairing

[figure]

sp3, tetrahedral, 2 unpaired electrons (paramagnetic)

[Ni(CO)4]: Ni(0), 3d10 (strong-field CO pairs the 4s electrons into 3d)

[figure]

sp3, tetrahedral, diamagnetic

Answer: (2)

Keep practising — Coordination Compounds

Ques. 2JEE Main 2025, 22 January (Morning Shift)

In which of the following complexes the CFSE, o will be equal to zero?

  1. K3[Fe(SCN)6]
  2. [Fe(en)3]Cl3
  3. [Fe(NH3)6]Br2
  4. K4[Fe(CN)6]
Ques. 3JEE Main 2025, 22 January (Evening Shift)

The correct order of the following complexes in terms of their crystal field stabilization energies is :

  1. [Co(NH3)4]2+ < [Co(NH3)6]2+ < [Co(NH3)6]3+ < [Co(en)3]3+
  2. [Co(NH3)4]2+ < [Co(NH3)6]2+ < [Co(en)3]3+ < [Co(NH3)6]3+
  3. [Co(NH3)6]2+ < [Co(NH3)6]3+ < [Co(NH3)4]2+ < [Co(en)3]3+
  4. [Co(en)3]3+ < [Co(NH3)6]3+ < [Co(NH3)6]2+ < [Co(NH3)4]2+
Ques. 4JEE Main 2025, 22 January (Evening Shift)

Identify the homoleptic complex(es) that is/are low spin. Choose the correct answer from the options given below :

  1. C and D only
  2. C only
  3. A and C only
  4. B and E only
Ques. 5JEE Main 2025, 22 January (Evening Shift)

The complex of Ni2+ ion and dimethyl glyoxime contains number of Hydrogen (H) atoms.

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