Silver articles become black on prolonged exposure to air

• GC Metals Non-Metals

Silver articles become black on prolonged exposure to air. This is due to the formation of

1. Ag₃N
2. Ag₂O
3. Ag₂S
4. Ag₂S and Ag₃N

Answer

Silver metal reacts with atmospheric sulphur compounds like H₂S gas and form black coating of Ag₂S over surface.

The correct option is C.