Question

a Shiny brown coloured element x on heating in air becomes black in colour name the element X and the black colour compound formed

Answer 1

A shiny brown coloured element X is copper & Black colured compound is copper (II) oxide.

2Cu + O2 ==== 2CuO (Copper II oxide)

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Answer 2

the shiny brown coloured element is copper and the black coloured compound form is copper oxide.