a Shiny brown coloured element x on heating in air become black in colour name the element X and the black coloured compound formed
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It's Copper and the black coloured compound is cuprous oxide Cu2O
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The shiny brown colored element ‘X’ is copper. When it is heated in air, it becomes black due to the deposit of copper oxide.
2Cu(brown) + O2 heat ---->2CuO(black)
2Cu(brown) + O2 heat ---->2CuO(black)
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