Giving chemical equation answer the following:
(a) What happens when copper is heated in air?
(b) What happens when the product obtained in above reaction is heated in hydrogen?
(a) When copper is heated in air, it reacts with the oxygen of air to form a black compound copper oxide.
2Cu + O2 2CuO
(b) When copper oxide formed in above reaction is heated in hydrogen, then copper oxide is reduced and brown copper metal is obtained.
CuO + H2 Cu + H2O
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