Question

How is photolytic decomposition used in photography ,also write the reaction involved.

Answer 1

Silver chloride when kept in the sun decomposes to form silver and chlorine gas.

The white silver chloride powder turns grey due to the formation of silver and with the release of chlorine gas.

Similarly, silver bromide also undergoes decomposition to give silver with the release of bromine gas when exposed to air.

Since the reactions are sensitive to light they are used in black and white photography.