Question

brown substance x on heating in air forms a substance Y.when hydrogen gas is passed over heated Y,it again changes back into X.name the substance X and Y

Answer 1

Answer:

The substance X is copper. On heating in air, it forms copper oxide Y.

When hydrogen gas is passed over black copper oxide then it turns brown as oxygen is removed by hydrogen.

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Answer 2

Answer:

Substance X ---> Brown Copper

Substance Y ---> Black Copper Oxide.

Reaction 1

2Cu      +      O₂ --------> 2CuO

brown                            black

Reaction 2

CuO      +      H₂ --------> Cu    +   H₂O

black                            brown    

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