Explanation

(c)
Electrolysis of 50% sulphuric acid is the commercial method for the preparation of hydrogen peroxide.
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ H_{2}SO_{4} = H^{+} + \ HSO_{4}^{-}$
At anode
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 2HSO_{4}^{-}\ \rightarrow H_{2}S_{2}O_{8} + \ 2e^{-}$
$\ H_{2}S_{2}O_{8} + \ 2H_{2}O\ \rightarrow 2H_{2}SO_{4} + \ H_{2}O_{2}$
At cathode
$\ \ \ \ \ \ \ \ \ \ \ 2H + 2e^{-}\ \rightarrow H_{2}$