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Silver ornaments gradually become dull/tarnished on exposure to air because silver reacts with which atmospheric substance to form a dark coating?

1. Hydrogen sulphide (H2S) forming Ag2S
2. Oxygen forming Ag2O
3. Carbon dioxide forming Ag2CO3
4. Nitrogen forming Ag3N

Correct answer: Hydrogen sulphide (H2S) forming Ag2S

Solution

Silver tarnishes because it reacts with traces of hydrogen sulphide (H2S) present in air, forming a thin black layer of silver sulphide (Ag2S).

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