A brown substance x on heating in air forms a substance y when hydrogen gas is passed over heated y it again changes back into x related questions
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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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Answer:when it burns give compound y
Explanation:hydrogen is x
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