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Coordination Compounds

JEE Main 2025 (Online) 22nd January Morning ShiftMCQMedium📈 Topic in 58% papers+4−1
Ques. 1JEE 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]

Answer

(1) K3[Fe(SCN)6]

Solution

CFSE = (-0.4 nt2g + 0.6 neg) o

[figure]

Only A ( Fe3+, d5, weak-field SCN-, t2g3eg2) has CFSE = 0.

Answer: (1)

Keep practising — Coordination Compounds

Ques. 2JEE 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. 3JEE 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. 4JEE Main 2025, 22 January (Evening Shift)

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

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