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प्रश्न
Which metal becomes black in the presence of hydrogen sulphide gas in air?
लघु उत्तर
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उत्तर
Silver metal becomes black in the presence of hydrogen sulphide gas in the air. Silver reacts with hydrogen sulphide gas in the air, forming a thin black layer of silver sulphide (Ag2S) on its surface. Therefore, silver jewellery or ornaments become dull due to the formation of a silver sulphide coating on their surface.
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