Q68 / 200 · NEET 2024 · Chemistry

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

  • A
    A and E only
  • B
    B and C only
  • C
    A and D only
  • Correct answer
    D
    B and D only

Solution

\begin{array}{lcc} Ions & No. of unpaired electrons & Configuration \\\mathrm{Ti}^{3+} & 1 & 3 d^1 \\\mathrm{Cr}^{2+} & 4 & 3 d^4 \\\mathrm{Mn}^{2+} & 5 & 3 d^5 \\\mathrm{Fe}^{2+} & 4 & 3 d^6 \\\mathrm{Sc}^{3+} & 0 & 3 d^0\end{array} Spin only magnetic moment is given by $\sqrt{n(n+2)} \mathrm{BM}$ $\therefore \mathrm{Cr}^{2+}$ and $\mathrm{Fe}^{2+}$ will have same spin only magnetic moment.

Hence, the correct answer is option: 'D'.

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