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PART - 1 CH - 1 Chemical Reactions and Equations — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10SciencePART - 1 CH - 1 Chemical Reactions and Equations2 Marks
Question
How can the black coating of copper oxide be removed chemically?
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Answer

The black coating of copper oxide can be removed chemically by passing the hydrogen gas over heated copper oxide. As a result, the black coating turns brown in colour as oxygen is removed by hydrogen.
$CuO + H _2 \longrightarrow Cu + H _2 O$

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