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Soundarya took $1 g$ a copper powder from a china dish and heated it. She then passed hydrogen gas over this heated substance and observed a visible change. What are the changes observed by her in each case? Explain with the help of a chemical equation.

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Detailed Solution

When $1 g$ of copper powder is taken in a china dish and heated, a black-colored substance is formed, called copper oxide.

The copper gets oxidized to copper oxide. $C u O$ and copper metal is obtained when hydrogen gas is passed over this heated substance.
The black-colored $C u O$ is reduced, and brown color $C u$ metal is produced.

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