(v) A brown substance X on heating in air forms a black substance Y. When hydrogen gas is passed over heated Y, it again changes back into X.
a. Name the substance X and Y
b. Write the chemical equations of the reaction.
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a. X is copper and Y is the copper oxide.
b. The chemical equation of the reaction is
2Cu + O2 = 2CuO
and again when hydrogen is passed,
CuO + H2 = Cu + H2O
b. The chemical equation of the reaction is
2Cu + O2 = 2CuO
and again when hydrogen is passed,
CuO + H2 = Cu + H2O
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