JEE MAIN - Chemistry (2022 - 25th July Evening Shift - No. 19)
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
4
Explanation
Among the pairs given, $$\mathrm{Cr}^{3+} / \mathrm{Cr}^{2+}$$ has negative reduction potential which is $$-0.41 \mathrm{~V}$$.
$$\operatorname{Cr}$$ (III) $$\Rightarrow d^{3}$$
Number of unpaired electrons $$=3$$
$$\mu=\sqrt{3(3+2)}=\sqrt{15} \simeq 4$$ B.M.
$$\operatorname{Cr}$$ (III) $$\Rightarrow d^{3}$$
Number of unpaired electrons $$=3$$
$$\mu=\sqrt{3(3+2)}=\sqrt{15} \simeq 4$$ B.M.
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