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Which metal b...

Question

Which metal becomes black in the presence of hydrogen sulphide gas in air?

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Solution

Silver metal becomes black in the presence of hydrogen sulphide gas in the air. Silver reacts with hydrogen sulphide gas in the air and forms a thin black layer of silver sulphide (Ag₂S) on it. Therefore, silver jewellery or ornaments become dull due to the formation of silver sulphide coating on their surface.

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