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Question
Mention with reason the colour changes observed when:
copper powder is strongly heated in the presence of oxygen.
Give Reasons
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Solution
Black copper oxide coats the surface of copper powder when it is heated in the presence of oxygen.
\[\ce{2Cu + O2 ->[Heat]2CuO}\]
This is an oxidation reaction.
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2019-2020 (March) Outside Delhi set 1
