Question

When KMnO₄ acts as an oxidising agent and ultimately forms MnO₄^2-, MnO₂, Mn₂O₃ and Mn⁺², then the number of electrons transferred in each case is

(a) 4, 3, 1,5

(b) 1, 5, 3, 7

(c) 1, 3, 4, 5

(d) 3, 5, 7, 1

Answer 1

Correct option is (c) 1, 3, 4, 5

\(\overset{+7}{KMnO_4} \longrightarrow [\overset{+6}MnO_4]^{2-}\), hence 1 electron is transferred.

\(\overset{+7}{KMnO_4} \longrightarrow \overset{+4}MnO_2\),hence 3 electron is transferred.

\(\overset{+7}{KMnO_4} \longrightarrow \frac 12\overset{+3}Mn_2O_3\), hence 4 electron is transferred.

\(\overset{+7}{KMnO_4} \longrightarrow \overset{+2}Mn\), hence 5 electrons are transferred.