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Q.
When $50 \%$ solution of $H _{2} SO _{4}$ is electrolysed by passing a current of high density at low temperature then main products of electrolysis are
Hydrogen
Solution:
$2 H _{2} SO _{4} \longrightarrow 2 H ^{+}+2 HSO _{4}^{-}$
$2 H ^{+}+2 e ^{-} \longrightarrow H _{2} \uparrow$
$2 HSO _{4}^{-} \longrightarrow \underset{\text{Peroxy disulphuric acid}}{H _{2} S _{2} O _{8}+2 e ^{\ominus}}$