📝 Multiple Choice Question
General-science
The black coating formed on silver jewellery is:
A
AgNO3
B
Ag2CO3
C
AgCl
D
Ag2 S
Explanation
Silver tarnishes over time when it naturally reacts with trace amounts of hydrogen sulfide gas (H2S) present in the ambient air. This historically common chemical reaction slowly forms a thin, protective black layer of silver sulfide (Ag2S) directly on the surface of the jewelry.
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