JEE Main 2019 Chemistry question

The calculated spin-only magnetic moments (BM) of the anionic and cationic species of [Fe(HO)][Fe(CN)], respectively, are:

Answer: (C)

Solution

Anion [Fe(CN)]: low-spin d, μ = 0. Cation [Fe(HO)]: high-spin

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Question ID VK-009330