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A shining 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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A shining 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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The element ‘X’ is copper and the black- coloured compound formed is copper(II) oxide.

2CuO + O2(g) ➝ 2CuO

(X)                    (Black)

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