2. When hydrogen gas is passed over a black substance 'X', the black
coating turns brown due to which type of reaction? Write a
chemical reaction involved in it
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The reaction is as follows.It is a combination reaction. If hydrogen gas is passed over heated copper oxide (CuO), the black coating on the surface turns brown as the reverse reaction takes place and copper is obtained. The second reaction is called oxidation-reduction reaction or redox reaction.
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Answer:
decomposition reaction
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