Question

# Explain in detail why some medicines are stored in dark-coloured bottles.

$2{{H}_{2}}{{O}_{2}}\xrightarrow{\text{UV rays}}2{{H}_{2}}O+{{O}_{2}}$
- Other examples chemical compounds which are affected by the presence of light are chloroform $(CHC{{l}_{3}})$, which results in the production of a poisonous gas called phosgene $(COC{{l}_{3}})$ in the presence of UV rays, and silver nitrate $(AgN{{O}_{3}})$, which decomposes into silver, nitrogen and oxygen when subjected to light.