How can you prove that red oxide of copper is not an element? - Vidyadip

Question

How can you prove that red oxide of copper is not an element?

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Answer

On heating red oxide of copper in the presence of hydrogen, its mass decreases and it forms shining metallic copper which is chemically different from the original compound $\mathrm{Cu}_2 \mathrm{O}+\mathrm{H}_2 \rightarrow 2 \mathrm{Cu}+\mathrm{H}_2 \mathrm{O}$.

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