Question

X is a metal on heating metal x with oxygen forms compound y which will be black in colour on passing hydrogen gas through compound y metal x and water is obtained

Answer 1

X is copper and y is copper oxide
2CU+O2.......2Cuo
CUO+H2........H2O+CU

Answer 2

Hii Shyamli,


● Answer -
Metal X => Copper (Cu)
Compound Y => Copper oxide (CuO)

● Reactions -
Metal X is Copper (Cu).

Copper (X) on heating in air gets oxidized to copper oxide (Y).
2Cu + O2 --> 2CuO

This copper oxide (Y) changes back to elemental copper (X) and water when hydrogen gas is passed over it.
CuO + H2 --> Cu + H2O


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