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# How many Faradays are required to reduce on mole of $MnO_4^-$ to $Mn^{+2}$

$\begin{array}{1 1}(a)\;1\\(b)\;2\\(c)\;3\\(d)\;5\end{array}$

$MnO_4^-+5e^-\rightarrow Mn^{+2}$
1 Faraday is equivalent to charge of one mole of electron.
Hence (d) is the correct option.