Question

when silver utensits are exposed to air they become black becomes

Answer 1

Silver utensils turn black as they react with atmospheric so2 to form Ag2s which is black in colour.

Answer 2

Silver articles when exposed to air become black after sometime. This is because the silver metal reacts with sulphur present in the atmosphere and forms silversulphide (black colour).

Ag (s) + H2S (g) → Ag2S (s) + H2 (g)