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Silver articles become black on prolonged exposure to air. This is due to the formation of- Ag3N
- Ag2O
- Ag2S
- Ag2S and Ag3N
Correct answer: (c) Ag2S
Explanation: Silver reacts with hydrogen sulphide in air and forms a black layer of silver sulphide. Therefore, the articles made of silver metal become dark on prolonged exposure to air.
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