Question

5. Silver articles become black on prolonged exposure to air. This is due to the formation
a. Silver oxide
b. Silver nitride
c. Silver sulphide
Silver nitrate​

Answer 1

Answer:

c.silver sulphide

Explanation:

silver reacts with atmospheric sulphur to form a coat of silver sulphide when exposed to air . This is basically called as corrosion of silver.

Answer 2

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Silver metal is highly unreactive, i.e., it does not react with oxygen. 

But with prolonged exposure to air, it reacts with hydrogen sulphide gas (H2S). 

Silver articles form a coating of silver sulphide (Ag2S) and lose their shine (get tarnished).

Hence the correct option is C.