Amongst the following, the complex ion that is expected to the highest magnetic moment at room temperature is · ABC26IN0376

Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Medium

Amongst the following, the complex ion that is expected to the highest magnetic moment at room temperature is

(a)$\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$

(b)$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$

(c)$\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$

(d)$\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$

Answer

Answer: B ✓ checked by 4AB · confidence medium

Explanation

[Fe(CN)₆]³⁻ (t₂g⁵) has μ ≈ 2.3 BM with orbital contribution, above [Cu(H₂O)₆]²⁺ (~1.9 BM); the other two are diamagnetic (b).

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