37. While $\mathrm { Fe } ^ { 3 + }$ is stable, $\mathrm { Mn } ^ { 3 + }$ is not stable in acid solution because\\
(A) $\mathrm { O } _ { 2 }$ oxidises $\mathrm { Mn } ^ { 2 + }$ to $\mathrm { Mn } ^ { 3 + }$\\
(B) $\mathrm { O } _ { 2 }$ oxidises both $\mathrm { Mn } ^ { 2 + }$ to $\mathrm { Mn } ^ { 3 + }$ and $\mathrm { Fe } ^ { 2 + }$ to $\mathrm { Fe } ^ { 3 + }$\\
(C) $\mathrm { Fe } ^ { 3 + }$ oxidises $\mathrm { H } _ { 2 } \mathrm { O }$ to $\mathrm { O } _ { 2 }$\\
(D) $\mathrm { Mn } ^ { 3 + }$ oxidises $\mathrm { H } _ { 2 } \mathrm { O }$ to $\mathrm { O } _ { 2 }$
\section*{Answer}
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(A)\\
(B)\\
(C)\\
(D)\\