Question

What change we observe if we put white silver chloride is placed in sunlight

Answer 1

Sunlight carries a good amount of energy, which makes silver chloride (AgCl) decompose in silver (Ag) and chloride ions. The metallic silver appears as very small 'flakes', esentially black, so these tiny black spots evenly distributed in the mass of white silver choride makes it look grey. Other silver salts are also decomposed by sunlight, that's why they are kept in bottles made of dark glass or light-proof polimers.