Question

Which of the following involves transfer of five electrons ?
(a) $MnO_4^- \rightarrow Mn^{2+}$
(b) $CrO_4^{2-} \rightarrow Cr^{3+}$
(c) $MnO_4^{2-} \rightarrow MnO_2$
(d) $Cr_2O_7^{2-} \rightarrow 2Cr^{3+}$

Answer 1

answer should be A as Mn goes from +7 oxidation state to +2 oxidation state