A brown substance x on heating in air from a substance why when hydrogen gas is passed over heated y it again changes back into x name the substance x and y name the type of chemical reaction occurring during both change
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x is copper and y is hydrogen
The chemical reaction happening in both the cases id redox reaction(reduction and oxidation reaction).
As in the first equation copper get oxidised to copper oxide and in the second equation copper oxide gets reduced to copper and hydrogen gets oxidised to form water.
Hope it helps:)
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