Which of the following involves the transfer | vedclass

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(A) To determine the number of electrons transferred,we calculate the change in the oxidation number $(O.N.)$ of the central metal atom.For option $A$

Vedclass · Accepted Answer

$MnO_4^- 	o Mn^{2+}$

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(A) To determine the number of electrons transferred,we calculate the change in the oxidation number $(O.N.)$ of the central metal atom.For option $A$: In $MnO_4^-$,the $O.N.$ of $Mn$ is $+7$. In $Mn^{2+}$,the $O.N.$ is $+2$. The change is $|7 - 2| = 5$ electrons.For option $B$: In $CrO_4^{2-}$,the $O.N.$ of $Cr$ is $+6$. In $Cr^{3+}$,the $O.N.$ is $+3$. The change is $3$ electrons.For option $C$: In $MnO_4^{2-}$,the $O.N.$ of $Mn$ is $+6$. In $MnO_2$,the $O.N.$ of $Mn$ is $+4$. The change is $2$ electrons.For option $D$: In $Cr_2O_7^{2-}$,the $O.N.$ of $Cr$ is $+6$. In $Cr^{3+}$,the $O.N.$ is $+3$. Since there are two $Cr$ atoms,the total change is $2 	imes (6 - 3) = 6$ electrons.Thus,the reaction involving the transfer of $5$ electrons is $MnO_4^- 	o Mn^{2+}$.

Which of the following involves the transfer of five electrons?

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