Question

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

Answer 1

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.