4. A brown substance 'X' on heating in air forms a compound 'Y'. When hydrogen gas is
passed over 'Y', it changes to 'X' again. (2)
(i) Name substances 'X' and 'Y'.
(ii) Name the processes occurring during the two changes.
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(I) X is COPPER and Y is COPPER OXIDE
(ii) 1st reaction is COMBINATION reaction and 2nd reaction is REDUCTION reaction .
Hope this helps
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