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  4. The spin-only magnetic moment value of M 3+ ion (in gaseous state) from the pairs Cr 3+ / Cr 2+, Mn 3+ / Mn 2, Fe 3+ / Fe 2+ and Co 3+ / Co 2+ that has negative standard electrode potential, is B.M. [Nearest integer]

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Q. The spin-only magnetic moment value of $M ^{3+}$ ion (in gaseous state) from the pairs $Cr ^{3+} / Cr ^{2+}, Mn ^{3+} / Mn ^2, \quad Fe ^{3+} / Fe ^{2+}$ and $Co ^{3+} / Co ^{2+}$ that has negative standard electrode potential, is B.M.
[Nearest integer]

JEE MainJEE Main 2022The d-and f-Block Elements

Solution:

$ \left. E _{ Cr ^{+3}}^0\right|_{ Cr ^{+2}}=-0.41 V$
$ {\left[ Cr ^{+3}\right]=4 s ^0 3 d ^3}$
$ \mu = \sqrt{ n ( n +2)} \text { B.M }$
$=\sqrt{15} \text { B.M } \sim 4 \text { B.M }$