Give an example of a reaction requires light.

Photolytic decomposition reactions take place in the presence of light.


A photodecomposition reaction is a decomposition reaction wherein the reactant is broken down by absorbing energy from photons into its constituents. Since the analysis of a compound takes place using light energy or, in other words, photons, therefore, such reactions are called photolytic reactions.

Example: The decomposition of silver chloride into silver and chlorine is caused by light energy.

2AgCl → 2Ag + Cl2

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