Question

Chemical and photochemical reactions in atmosphere

Answer 1

Photochemical decomposition reactions (or simply photolysis) are those reactions in which a chemical compound decomposes by the action of sunlight. For example, silver chloride in the presence of light decomposes to give silver and chlorine gas.

 

Answer 2

Those process in which compound are decomposed into two or more simpler substances in the presence of Sunlight is called photochemical reaction.
For example AgCl2 is decomposed in the presence of Sunlight to form Ag+Cl2.
Due to this AgCl2 is taken away from sunlight and contained in Dark bottle.