Question

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.Name the substances x and y and name the chemical process

Answer 1

Explanation:

I) Substance X is 'Copper' and substance Y is 'Copper oxide'.

(ii) The chemical process occurring during the two changes is:-

Oxidation and reduction.

(iii) The chemical equations involved are:-

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

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