Question

A brown coloured metal x when heated gives a black colour metal oxide y. the black colour compound y reacts with hcl to give z. find x,y,z

Answer 1

The shiny brown colored element x is copper. When copper metal is heated in air, it forms a black colour compound copper oxide. So,
the black coloured compound is copper oxide (CuO).
2Cu+O2-----heat-----2CuO
when it reacts with HCl it gives
CuO+2HCl--------CuCl2+ H2O
therefore z is CuCl2

Answer 2

Answer:The shiny brown colored element x is copper. When copper metal is heated in air, it forms a black colour compound copper oxide. So,

the black coloured compound is copper oxide (CuO).

2Cu+O2-----heat-----2CuO

when it reacts with HCl it gives

CuO+2HCl--------CuCl2+ H2O

therefore z is CuCl2

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Explanation: hope you've get it