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Q.
In acidic medium $ MnO_4 $ is converted to $ Mn^{2+} $ . The quantity of electricity in faraday required to reduce $ 0.5 $ mole of $ MnO_4 $ to $ Mn^{2+} $ would be :
In $MnO_4^-$ the oxidation number of $Mn$ is $+7$
$∴ \overset{+7}{Mn} + 5e^- \to \overset{+7}{Mn} $
In the reaction, $5$ electrons are involved hence $5$ faraday will be needed for the reduction of $1$ mole of $MnO_4^-$
Therefore for $0.5$ mole of $MnO_4^-$. number of faradays required $= 2.5\,F$