Assertion: When copper powder is heated in air, it turns black. Reason:
Copper reacts with H2S gas of the air forming black CuS.
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Answer:
Assertion is correct reason is incorrect.
Explanation:
Copper is a reactive metal. In a process called oxidation, copper reacts slowly in the presence of oxygen, resulting in copper oxide. This is what we call tarnish, which is generally perceived as a brown or black coloration on the surface.
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