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What happens when hydrogen gas is passed over the heated copper oxide (CuO)?

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What happens when hydrogen gas is passed over the heated copper oxide (CuO)?

A. Black coating on the surface turns blue.

B. Black coating on the surface turns brown.

C. Black coating on the surface turns green. 

D. Black coating on the surface turns white.

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When hydrogen gas is passed over hot copper oxide, the black coating on the surface turns brown as the reverse reaction takes place and copper is obtained.

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