Q. 8
Describe and activity to show decomposition reaction in which light is used to decompose a reactant. Write chemical equation of the reaction and state its one use. (2012)
Answer :
Take about 2 g silver chloride in a china dish. It is first white in colour. Now place this china dish in sunlight for some time. After some time it is observed that white silver chloride turns grey. This is due to the decomposition of silver chloride into silver and chlorine by light.
2AgCl 
2Ag (s) + Cl2 (g)
Silver bromide also decomposed to silver and bromine by light.
2AgBr 
2Ag (s) + Br2 (g)
Use: The reaction is used in black and white photography.
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