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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Answer:
Copper is the brown coloured element X which on heating in air becomes black coloured compound copper oxide.
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Copper oxide
The brown coloured metal is copper. Hence ′X′ is copper and the black coloured compound formed is Copper oxide.
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