Question

a brown substance x on heating in air from a substance y when hydrogen gas is passed over heated y it again change back into x name the substance x and y,name the chemical process occuring during both the changes​

Answer 1

Answer:

substance x is copper

and substance y is copper oxide

the chemical process during this is oxidation and reduction

The chemical equations involved are:- 2Cu (s) + O2 (g) ----> 2CuO CuO + H2 (g) ----> Cu + H2O

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