The spin only magnetic moment () value (B.M.) of the compound with strongest oxidising power among , TiO and VO is _______ B.M. (Nearest integer). [2025]

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Solution

Q.
The spin only magnetic moment ( $μ$ ) value (B.M.) of the compound with strongest oxidising power among ${Mn}_{2} O_{3}$ , TiO and VO is _______ B.M. (Nearest integer). [2025]

Ans.
(5)

$E_{{Mn}^{3 +} / {Mn}^{2 +}}^{\circ} = + 1.57 V, E_{V^{2 +} / V}^{\circ} = - 1.18 V, E_{{Ti}^{2 +} / Ti}^{\circ} = - 1.63 V$

As reduction potential of ${Mn}^{3 +}$ is more than that of $V^{2 +}$ and ${Ti}^{2 +}$ , ${Mn}_{2} O_{3}$ is a stronger oxidising agent than VO and TiO.

${Mn}^{3 +} =_{18} [Ar]$ $3 d^{4}$ , number of unpaired electrons ( $n$ ) = 4.

Spin only magnetic moment ( $μ$ ) $= \sqrt{n (n + 2)} BM$

$= \sqrt{4 (4 + 2)} BM = 4.9 BM$ (nearest integer is 5)

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