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
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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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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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