The spin-only magnetic moment value of the ion among and , that acts as strong oxidising agent in aqueous solution is _______ B.M.

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Solution

Q.
The spin-only magnetic moment value of the ion among ${Ti}^{2 +}, V^{2 +}, {Co}^{3 +}$ and ${Cr}^{2 +}$ , that acts as strong oxidising agent in aqueous solution is _______ B.M. (Near integer).

(Given atomic numbers : Ti : 22, V : 23, Cr : 24, Co : 27) [2024]

Ans.
(5)

   $E_{{Co}^{3 +} / {Co}^{2 +}}^{\circ} = + 1.97 V$

Since $E_{{Co}^{3 +} / {Co}^{2 +}}^{\circ} > 0, {Co}^{3 +}$ is a strong oxidizing agent.

${Co}^{3 +} = {}_{18} [Ar] 3 d^{6}$

  Number of unpaired electrons in ${Co}^{3 +} (n) = 4$

  Spin only magnetic moment $(μ)$

$= \sqrt{n (n + 2)} BM = \sqrt{4 (4 + 2)} BM = 4.9 BM \approx 5 BM$

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