Question
Electrolytic decomposition $\&$ photochemical decomposition.

Answer

Electrolytic decomposition : "A decomposition reaction which is brought about by $-$ passage of electric current."
$\ce{2H_2O} \xrightarrow[\text { Currenct }]{\text { Electricity }} \ce{2H_2}+ O_2$
Photochemical decomposition: "A decomposition reaction which takes place in presence of light." e. g. decomposition of silver salts in presence of sun light.

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