Question
On the basis of the following data, explain why $Co - \ (III)$ is not stable in aqueous solution?
$\ce{Co^{3+}+e^{-} \rightarrow Co^2+, E^0=+1.82 V}$
$\ce{2 H_2 O \rightarrow O_2+4 H^{+}+4 e^{-}, E^0=1.23 V}$
$\ce{Co^{3+}+e^{-} \rightarrow Co^2+, E^0=+1.82 V}$
$\ce{2 H_2 O \rightarrow O_2+4 H^{+}+4 e^{-}, E^0=1.23 V}$