Silver articles become black on prolonged exposu

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Solution

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

1 $A g_{3} N$

2 $A g_{2} O$

3 $A g_{2} S$

4 $A g_{2} S a n d A g_{3} N$

Ans.
(3)

On prolonged exposure to air, silver metal reacts with hydrogen sulphide gas and forms a coating of silver sulphide $(A g_{2} S)$ . Due to this, silver loses its shine, turns black, and gets tarnished.

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