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Coordination Compounds

JEE Main 2025 (Online) 24th January Evening ShiftMCQMedium📈 Topic in 11% papers+4−1
Ques. 1JEE Main 2025, 24 January (Evening Shift)

When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel (II) chloride, the sequence of colour change observed will be:

  1. Pale Blue Blue Green Violet
  2. Pale Blue Blue Violet Green
  3. Green Pale Blue Blue Violet
  4. Violet Blue Pale Blue Green

Answer

(3) Green Pale Blue Blue Violet

Solution

en replaces H2O step by step; o increases:

[Ni(H2O)6]2+ (green)

[Ni(H2O)4(en)]2+ (pale blue)

[Ni(H2O)2(en)2]2+ (blue)

[Ni(en)3]2+ (violet)

Answer: (3)

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Ques. 2JEE Main 2025, 23 January (Morning Shift)

The d-electronic configuration of an octahedral Co (II) complex having magnetic moment of 3.95 BM is:

  1. e4t23
  2. t2g6eg1
  3. t2g5eg2
  4. t2g3eg0
Ques. 3JEE Main 2025, 23 January (Morning Shift)

The complex that shows Facial - Meridional isomerism is :

  1. [Co(en)2Cl2]+
  2. [Co(NH3)3Cl3]
  3. [Co(NH3)4Cl2]+
  4. [Co(en)3]3+
Ques. 4JEE Main 2025, 23 January (Evening Shift)

Identify the coordination complexes in which the central metal ion has d4 configuration. Choose the correct answer from the options given below :

  1. B, C and D only
  2. C and E only
  3. A, B and E only
  4. B and D only
Ques. 5JEE 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
Ques. 6JEE 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. 7JEE 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. 8JEE 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. 9JEE Main 2025, 22 January (Evening Shift)

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

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