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A shiny brown coloured element ‘X’ o...

A shiny brown coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black coloured compound formed

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(i) The shiny brown coloured element X is copper metal (Cu).
(ii) When copper metal is heated in air, it forms a black coloued compound copper oxide. So, the black coloured compound is copper oxide or copper (II) oxide, CuO.
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