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A shiny brown-coloured element ‘X’ on heating in air becomes black in colour.

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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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Element 'X'  is copper and the black coloured compound is copper (11) oxide

Equation: 2Cu(s) + O2(g) → 2CuO(s)

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