Silver articles become black on prolonged exposure to air. This is due to the formation of (a) Ag3N (b) Ag2O (c) Ag2 S Ag2S and Ag3N

• Soln:

Answer is (c) Ag₂S

Explanation:

Silver metal reacts with sulphur present in the atmosphere to form Ag₂S. Ag2S is responsibkle foer black coloration of silver articles.