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Question
A shiny brown coloured metal ‘X’ on heating in air becomes black in colour. The element 'X' and black coloured compound are ___ and ___ respectively.
A shiny brown coloured metal ‘X’ on heating in air becomes black in colour. The element 'X' and black coloured compound are ___ and ___ respectively.
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Solution
The correct option is A copper, copper oxide
The colour of copper element is shiny brown. When copper is heated in air it turns black due to the formation of copper oxide layer on it.
2Cu(s)+O2(g)→2CuO(s)
Hence, element 'X' is copper and the black coloured compound is copper oxide.
The colour of copper element is shiny brown. When copper is heated in air it turns black due to the formation of copper oxide layer on it.
2Cu(s)+O2(g)→2CuO(s)
Hence, element 'X' is copper and the black coloured compound is copper oxide.
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