Question

a shiny brown coloured metal on heating its surface becomes black. When H2 gas is passed through black coloured compound the brown colour reappears. Name the brown coloured metal and black coloured Y compound. Also explain your observation with relevant chemical equation.

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Answer 1

Answer:

Brown coloured compound is copper

Compound Y is copper oxide or cupric oxide

Explanation:

Cu + O2 = 2Cuo {= means gives}

Cu brown in color

CuO black in color due to oxidation

2CuO + H2 = H2O + Cu

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