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QJEEM22Chb630: JEE Main 2022 Chemistry - Class 12 JEEM22Chb630 Solution: The spin-only magnetic moment value of M 3+ ion (in gaseous…

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]

Step-by-Step Verified Solution

Among the pairs given, Cr3+/Cr2+\mathrm{Cr}^{3+} / \mathrm{Cr}^{2+} has negative reduction potential which is −0.41 V-0.41 \mathrm{~V} .

Cr⁡\operatorname{Cr} (III) ⇒d3\Rightarrow d^{3}

Number of unpaired electrons =3=3

μ=3(3+2)=15≃4\mu=\sqrt{3(3+2)}=\sqrt{15} \simeq 4 B.M.

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