The corrosion of silver, copper and iron articles will produce _______, respectively.
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A.
silver sulphide, copper sulphide and iron oxide
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B.
silver carbonate, copper carbonate and iron oxide
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C.
silver oxide, copper carbonate and iron carbonate
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D.
silver sulphide, copper carbonate and iron oxide
Correct Answer:
D. silver sulphide, copper carbonate and iron oxide
Explanation:
Silver undergoes corrosion when it reacts with sulfur-containing gases in the air, such as hydrogen sulfide, to form a black layer of silver sulfide. Copper reacts with moisture, oxygen, and carbon dioxide to develop a characteristic green coating known as basic copper carbonate. Iron corrodes in the presence of water and oxygen to produce a reddish-brown flaky substance called hydrated ferric oxide, commonly known as rust. Therefore, the respective corrosion products for silver, copper, and iron are silver sulfide, copper carbonate, and iron oxide.
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