Q10. Copper metal when kept exposed to air for long time shows, dull green spots. Select the correct reason a) Copper forms a black layer of cupric oxide which further reacts with water and CO₂ b) Copper reacts with oxygen to form green coloured cupric oxide c) Copper reacts with hydrogen sulphide gas in air to form green cupric sulphide d) Copper reacts with water to form copper carbonate.
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Answer:
D option is correct.
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