Question

0.7. 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 substances 'X' and 'Y'.
(ii) Name the chemical process occurring during both
the changes.
(iii) Write the chemical equations involved in both the
changes. ​

Answer 1

Answer:

2 . oxidation of copper

displacement reaction