A brown substance x on heating in air forms substance y when h2 gas is passed over heated y it again changes back into x
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the substance is Cu on heating it in air it form copper oxide when H2 gas is passed over copper oxide heated it again changes into cu
Cu + O2 —›CuO
CuO +H2—›Cu+H2O
Cu + O2 —›CuO
CuO +H2—›Cu+H2O
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