Question

Which one of following reactions indicates the reducing ability of hydrogen peroxide in basic medium?

• A. $2Mn{O}_4^{-}+3H_2{O}_2\to 2Mn{O}_2+3O_2+2H_{2}O+2O{H}^{-}$
• B. $PbS+4H_2{O}_2\to PbS{O}_4+4H_{2}O$
• C. $HOCl+H_2{O}_2\to H_3{O}^{+}+C{l}^{-}+O_2$
• D. $M{n}^{2+}+H_2{O}_2\to M{n}^{4+}+2O{H}^{-}$

Answer 1

The correct option is A $2Mn{O}_4^{-}+3H_2{O}_2\to 2Mn{O}_2+3O_2+2H_{2}O+2O{H}^{-}$

$\stackrel{+7}{2Mn{O}_4^{-}}+3H_2{O}_2\to \stackrel{+4}{2Mn{O}_2}+3O_2+2H_{2}O+2O{H}^{-}$

In basic medium $Mn{O}_4^{-}$ is reduced to $Mn{O}_2$ whereas in acidic medium it is reduced to $M{n}^{2+}$

In option (A) and (C) reducing action of hydrogen peroxide is shown. In option (A) it is in acidic medium, in option (C) it is in basic medium