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Coordination Compounds · Question 53

JEE Main 2025 (Online) 2nd April Evening ShiftMCQMedium📈 Topic in 55% papers+4−1
1

The d-orbital electronic configuration of the complex among [Co(en)3]3+, [CoF6]3-, [Mn(H2O)6]2+ and [Zn(H2O)6]2+ that has the highest CFSE is:

  1. t2g6eg0
  2. t2g3eg2
  3. t2g4eg2
  4. t2g6eg4

Answer

(1) t2g6eg0

Solution

CFSE (octahedral) = (-0.4 nt2g + 0.6 neg) o (pairing energy ignored)

[Co(en)3]3+: Co3+, d6; en is a strong-field ligand low spin t2g6eg0; CFSE = -2.4 o

[CoF6]3-: d6, F- weak field t2g4eg2; CFSE = -0.4 o

[Mn(H2O)6]2+: d5 high spin t2g3eg2; CFSE = 0

[Zn(H2O)6]2+: d10 t2g6eg4; CFSE = 0

Also o is largest for Co3+ with the chelating strong-field ligand en.

Highest CFSE: [Co(en)3]3+, configuration t2g6eg0

Answer: (1)

JEE Main 2025 (Online) 2nd April Evening Shift

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2

The correct increasing order of stability of the complexes based on 0 value is : I. [Mn(CN)6]3- II. [Co(CN)6]4- III. [Fe(CN)6]4- IV. [Fe(CN)6]3-

  1. I < II < IV < III
  2. IV < III < II < I
  3. III < II < IV < I
  4. II < III < I < IV
JEE Main 2025 (Online) 29th January Morning Shift
3

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

  1. (A)-(III), (B)-(I), (C)-(I), (D)-(IV)
  2. (A)-(III), (B)-(II), (C)-(III), (D)-(IV)
  3. (A)-(IV), (B)-(II), (C)-(I), (D)-(III)
  4. (A)-(IV), (B)-(I), (C)-(II), (D)-(III)
JEE Main 2025 (Online) 29th January Morning Shift
4

Match 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)-(III), (B)-(IV), (C)-(I), (D)-(II)
  3. (A)-(I), (B)-(IV), (C)-(III), (D)-(II)
  4. (A)-(III), (B)-(II), (C)-(I), (D)-(IV)
JEE Main 2025 (Online) 28th January Evening Shift

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