The spin only magnetic moment of Fe+2 ion is ____.

Q.1 (ii) The spin only magnetic moment of Fe⁺² ion is ____.

A. 3.806 BM

B. 4.899 BM

C. 5.796 BM

D. 6.817 BM

Doubtly Asked 29 Oct 2026 Board exam · July 2024 hsc 12th Save WhatsApp Report

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Answer: (b) 4.899 BM

Fe (Z = 26): [Ar] 3d⁶ 4s², so Fe²⁺ is [Ar] 3d⁶ with \(n = 4\) unpaired electrons.

\(\mu = \sqrt{n(n+2)} = \sqrt{4\times 6} = \sqrt{24} = 4.899\) BM.

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report

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