Question

Why does a photographic film get spoilt if exposed to sunlight? Give an equation in support of your answer.

Answer 1

• The photographic film involves the use of silver salts that decompose in the presence of sunlight and the film get spoilt.
• Silver salts undergoes photolytic decomposition when exposed to sunlight.

Example : Silver chloride decompose in the presence of sunlight to form silver and chlorine gas.

$2\mathrm{AgCl}\left(\mathrm{s}\right)\stackrel{\mathrm{Sunlight}}{\to }2\mathrm{Ag}\left(\mathrm{s}\right)+{\mathrm{Cl}}_2\left(\mathrm{g}\right)$