JEE MAIN - Chemistry (2025 - 28th January Evening Shift - No. 21)
The spin only magnetic moment ( $\mu$ ) value (B.M.) of the compound with strongest oxidising power among $\mathrm{Mn}_2 \mathrm{O}_3, \mathrm{TiO}$ and VO is ____________ B.M. (Nearest integer).
Answer
5
Explanation
Strongest oxidising power among the option is $\mathrm{Mn}_2 \mathrm{O}_3$ because of $\mathrm{E}^{\circ}$ value
$$\begin{aligned} & \mathrm{E}_{\mathrm{Mn}^{+3} / \mathrm{Mn}^{+2}}^{\circ}=+1.57 \mathrm{~V} \\ & \mathrm{Mn}^{+3} \rightarrow \mathrm{~d}^4 \text { configuration } \\ & \mu=\sqrt{24} \mathrm{BM} \\ & =4.89 \mathrm{BM} \\ & \Rightarrow 5 \end{aligned}$$
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