Question

A brown substance X on heating in air forms a substance Y .when hydrogen gas is passed over heated Y it again turns back to X
identify X and Y
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Answer 1

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 2

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the brown substance 'X'copper. as we know when it is heated 'Y' copper oxide is formed.

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