Question

a Shiny brown coloured element x on heating in air becomes a black coloured compound name the element X and the black coloured compound formed also write the equation

Answer 1

The shiny brown coloured element 'X' is copper and the black coloured compound formed is Copper oxide. The reaction is as follows :

2Cu + O2 + Heat ⇨ 2CuO
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Answer 2

HELLO!!!!!
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✴The Shiny Brown coloured element 'X' is "COPPER"
✴The Black coloured compound formed is "COPPER OXIDE "(CuO).
➡️The equation of the reaction involved on heating copper is given below⬇️
2Cu(s)+ O2(g)-----> 2CuO(s)
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HOPE IT HELPS U✌✌