Question

a brown substance x on heating in air forms a substance y when hydrogen is passed over heated y it again changes to x name x and y

Answer 1

x is copper an d on heating in air it becomes copper oxide because oxygen is removed

Answer 2

Answer:

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

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