Question

brown substance x on heating in air forms a substance why when hydrogen gas is passed over heated Y it again changes back into X 1.name the substance X and Y 2.name the type of chemical reaction occurring during both the changes 3.write the chemical equation for the reactions​

Answer 1

1.substance X is copper

substance Y is copper oxide

2.Redox Reaction(i.e Oxidation and Reduction)

3. Chemical equations:-

2Cu (s) + O2 (g) ----> 2CuO

CuO + H2 (g) ----> Cu + H2O

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Answer 2

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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