Why do we store silver chloride in dark coloured bottles?
[1 Mark]

Silver chloride on exposure to sunlight decomposes and produces elemental silver and chlorine gas.

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

To avoid this decomposition, it is stored in dark coloured bottles.
[1 Mark]