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Given two examples of reduction....

Given two examples of reduction.

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(1) When hydrogen gas is passed over black copper oxide a reddish coloured layer of copper is formed
In this reaction an oxygen atom removed from CuO to form copper , hence ,this is reduction.
`underset("Copper oxide")(CuO_((s)))+H_(2_((g)))rarrunderset("Copper")(Cu_((s)))+H_(2)O_(1)`
(2) When hydrogen gas is passed over red hot coke, methance is obtained .
Here,hydrogen is added to coke (carbon). Hence , this is reduction.
`underset("Carbon")(C_((s)))+underset("Hydrogen gas ")(2H_(2_((g))))rarrunderset("Methane")(CH_(4_((g))))`
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