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9. 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. (i) Name the substance X and Y (ii) Name the chemical processes occurring during both the changes. (iii) Write the chemical equations involved in both the changes.

Asked by nisha 10th September 2013, 5:24 PM
Answered by Expert

i) X and Y  is copper and Copper oxide

iii)Cu (brown substance,  X, Copper) + O2 = CuO (Y , black)Copper oxide)


CuO + H2  = Cu + H2O

ii)CuO undergo reduction and H2 goes oxidation so, it is redox reaction.
Answered by Expert 10th September 2013, 9:39 PM
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