Question

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A brown substance 'X' on heating in air forms a substance 'Y' . when hydrogen gas is passed over heated again changes back into 'X'

1. Name the substance 'X' and ' Y'

2. Name the type of chemical reactions occurring during both the changes.

3. Write the chemical Equationipof the reaction

Answer 1

Heya buddy........
Here is your answer.......

1. Substance X is copper.
Substance Y is copper oxide.

2. The first case , it is oxidation and In second case it is a redox reaction.

3. 2Cu + O2 -------> 2CuO
CuO + H2 -------> Cu + H2O



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