A brown substance a on heating in air turns b when hydrogen is pased
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Accepted Answer: The brown substance' X' is copper .When it is heated copper oxide is formed . 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.
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it is cuo when h2 is passed through it a brown coating is left after a black coating it is also an reversible reaction and we can get copper through it
it is cuo when h2 is passed through it a brown coating is left after a black coating it is also an reversible reaction and we can get copper through it
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