Question

Explain the decomposition reaction of silver chloride and sliver bromide by light.

Answer 1

↵Dear Student,

When silver chloride and silver bromide exposed to light they decompose into their constituent ions.

• White colour of silver chloride turns grey in presence of light due to its decomposition.

$\text{AgCl}\left(\mathrm{white}\mathrm{colour}\right)\stackrel{\mathrm{light}}{\to }{\text{Ag}}^{\text{2+}}{\text{+ Cl}}^{\text{-}}$

• Yellow colour of silver bromide turns grey in presence of light due to its decomposition.

$\mathrm{AgBr}\left(yellow\mathrm{colour}\right)\mathrm{}\stackrel{\mathrm{light}}{\to }{\mathrm{Ag}}^{2+}+{\mathrm{Br}}^{\mathrm{-}}$