In which one of the following changes is ther | vedclass

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(A) To determine the number of electrons transferred,we calculate the change in the oxidation state of the central metal atom.$A$. In $MnO_4^-$,the ox

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 state of the central metal atom.$A$. In $MnO_4^-$,the oxidation state of $Mn$ is $+7$. In $Mn^{2+}$,it is $+2$. The change is $7 - 2 = 5$ electrons.$B$. In $CrO_4^{2-}$,the oxidation state of $Cr$ is $+6$. In $Cr^{3+}$,it is $+3$. The change is $6 - 3 = 3$ electrons.$C$. In $MnO_4^{2-}$,the oxidation state of $Mn$ is $+6$. In $MnO_2$,it is $+4$. The change is $6 - 4 = 2$ electrons.$D$. In $Cr_2O_7^{2-}$,the oxidation state of $Cr$ is $+6$. In $2Cr^{3+}$,the total change for two $Cr$ atoms is $2 	imes (6 - 3) = 6$ electrons.Therefore,the correct change involving the transfer of five electrons is $MnO_4^- 	o Mn^{2+}$.

In which one of the following changes is there a transfer of five electrons?

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