The spin-only magnetic moment value of M3+ ion (in gaseous state) from the pairs Cr3+ / Cr2+, Mn3+ / Mn2+, Fe3+ / Fe2+ and Co3+ / Co2+ that has negative standard electrode potential, is ____________ B.M. [Nearest integer]
Answer (integer)
4
Solution
Among the pairs given, $\mathrm{Cr}^{3+} / \mathrm{Cr}^{2+}$ has negative reduction potential which is $-0.41 \mathrm{~V}$.
<br/><br/>
$\operatorname{Cr}$ (III) $\Rightarrow d^{3}$
<br/><br/>
Number of unpaired electrons $=3$
<br/><br/>
$\mu=\sqrt{3(3+2)}=\sqrt{15} \simeq 4$ B.M.
About this question
Subject: Chemistry · Chapter: Electrochemistry · Topic: Electrochemical Cells
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