A shiny brown coloured element ‘X’ on heating in the air becomes black in colour. Name the element ‘X’ and the black coloured compound formed.
The shiny brown-colored element is Copper metal (Cu). When the metal is heated in the air, it reacts with atmospheric oxygen to form copper oxide. Hence the black-colored compound is the copper oxide.
2Cu(s) + O2(g) → 2CuO(s)
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