A brown substance 'X' on heating in air forms a compound 'Y'. When hydrogen gas is passed over 'Y', it changes to 'X' again. (i) Name the substances 'X' and 'Y'. (ii) Name the processes occuring during the two changes.
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x is copper
y is copper oxide
Cu +O2→2CuO
CuO+H2→Cu+H2
y is copper oxide
Cu +O2→2CuO
CuO+H2→Cu+H2
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