Dry hydrogen gas was passed over hot copper (ii) oxide in a combustion tube as shown in the diagram
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If hydrogen gas is passed over heated copper oxide (CuO), the black coating on the surface turns brown as the reverse reaction takes place and copper is obtained. ... ... The balanced chemical equation with the physical state for this reaction is given below. Cu O (s) + H2 (g) ===> heat ==> Cu (s) + H2O (
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