Question : Silver articles become black after their exposure to air because they react with _____________in the air.
Option 1: nitrogen
Option 2: hydrogen
Option 3: sulphur
Option 4: carbon dioxide
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Correct Answer: sulphur
Solution : The correct answer is sulphur .
Silver articles become black after their exposure to air because they react with the sulphur present in the air. It forms a layer of silver sulphide on the surface. Because of this formation of the silver sulphide layer, the silver appears black and dull. It is a highly unreactive metal. But with prolonged exposure to sulphur of Hydrogen Sulphide, it loses its shine.
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