Question

what are photo decomposition reaction

Answer 1

reaction done in the presence of sunlight for example
2AgBr-presenceof light give-2Ag(s)+Br2(g)

Answer 2

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• Photolysis (also called photodissociation and photodecomposition) is a chemical reaction in which an inorganic chemical (or an organic chemical) is broken down by photons and is the interaction of one or more photons with one target molecule.