Give the electrode reactions for formation of $H_{2}$ and $O_{2}$ gas $[2 : 1]$ from acidified water using inert $P t$ electrodes.

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Solution

During electrolysis of water,
At anode: $2 H_{2} O \to O_{2} + 4 H^{+} + 4 e^{-}$
At cathode: $4 H_{2} O + 4 e^{-} \to 2 H_{2} + 4 O H^{-}$

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