Complex(es) which has/have unpaired electron(s) that is equal to that of iron center in oxymyoglobin is/are A. [Fe(ox)₃]³⁻ B. [Fe(CN)₆]³⁻ C. [NiCl₄]²⁻ D. [Cu(NH₃)₄]²⁺ (Given: ox = oxalato) Correct answer is

Q64 · CSIR-NET Chemistry, December 2019

Paper: CSIR-NET December 2019 · Subject: Inorganic Chemistry · Chapter: Bioinorganic Chemistry · Topic: Iron Sulfur Proteins · Marks: 2 · Difficulty: Medium

Complex(es) which has/have unpaired electron(s) that is equal to that of iron center in oxymyoglobin is/are A. $[\mathrm{Fe(ox)_3}]^{3-}$ B. $[\mathrm{Fe(CN)_6}]^{3-}$ C. $[\mathrm{NiCl_4}]^{2-}$ D. $[\mathrm{Cu(NH_3)_4}]^{2+}$ (Given: ox = oxalato) Correct answer is

(a)A and B

(b)B and D

(c)C only

(d)C and D

Answer

Answer: B ✓ checked by 4AB · confidence medium

Explanation

Treating oxymyoglobin as Fe(III)–superoxide, the iron is low-spin d⁵ with one unpaired electron. [Fe(CN)₆]³⁻ (low-spin d⁵) and [Cu(NH₃)₄]²⁺ (d⁹) also have one; [Fe(ox)₃]³⁻ has five and [NiCl₄]²⁻ two.

Study loop for Bioinorganic Chemistry

1. Practise the PYQsPrevious-year questions, with answers

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