allerySilver objects turn black on long exposure to air mainly because:
AAg combines with H₂S to form Ag₂S
BAg combines with O₂ to form Ag₂O
CAg reacts with CO₂ to form Ag₂CO₃
DAg dissolves in moisture slowly
Answer & Solution
Correct answer: A. Ag combines with H₂S to form Ag₂S
Atmospheric hydrogen sulfide reacts with silver to form black silver sulfide (Ag₂S).
This is the corrosion mechanism for silver — not simple oxidation by O₂.
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