'Spin only' magnetic moment is same for which of the following ions?A. Ti^3+ B. Cr^2+ C. Mn^2+ D. Fe^2+ E. Sc^3+Choose the most appropriate answer from the options given below:

1. A and D only

2. B and D only

3. A and E only

4. B and C only

Doubtly Asked 30 Oct 2026 NEET UG 2024 Practice test neet Save WhatsApp Report

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Answer: 2. B and D only

Key idea: \(\mu=\sqrt{n(n+2)}\) BM, so equal unpaired electrons give equal moment.

\(\mathrm{Ti^{3+}}\) (\(d^1\)): 1
\(\mathrm{Cr^{2+}}\) (\(d^4\)): 4
\(\mathrm{Mn^{2+}}\) (\(d^5\)): 5
\(\mathrm{Fe^{2+}}\) (\(d^6\)): 4
\(\mathrm{Sc^{3+}}\) (\(d^0\)): 0

B and D both have 4 unpaired electrons (4.90 BM). Option 2.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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