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A brownsubstance "X: on heating in air forms substance "Y". When hydrogen gas is passed over heated "Y" it again changes back into "X"

(a) name the subastance X and Y



X is copper , y is copper  oxide
{cu + o2 gives 2cu
and then cuo + h2 gives cu+ h2o}
1 5 1
Cu + o2 = 2cu
 cuo + h2 = cu+ h2o
x is copper , y is copper  oxide

2 4 2
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