Question

What change in colour is observed when white silver chloride is left exposed to sunlight? What type of chemical reaction is this?

Answer 1

DEAR STUDENT,
When silver chloride is left exposed in sunlight, it gets decomposed to form grey colour silver and chlorine gas is evolved.
2AgCl ⟶ 2Ag(s) + Cl₂(g)
Silver chloride (AgCl) is white in colour and elemental silver (Ag) is grey in colour. Hence, the colour change observed when white silver chloride is left exposed in sunlight is from white to grey and the type of chemical reaction is photolytic decomposition reaction or photolysis.
REGARDS,