A shiny brown-coloured element 'X' on heating in air becomes black in colour. Name the element 'X'?

Sodium

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Calcium

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Copper

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Aluminium

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Solution

The correct option is C Copper
'X' is copper (Cu) and the black-coloured compound formed is copper oxide(CuO). The equation of the reaction involved on heating copper is given below:
$2 C u (S h i n y b r o w n i n c o l o u r) + O_{2} H e a t \to 2 C u O (B l a c k i n c o l o u r)$

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A shiny brown-colored element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black coloured compound formed.

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A shiny brown-coloured element 'X' on heating in air becomes black in colour. Name the element 'X'?

The correct option is C Copper'X' is copper (Cu) and the black-coloured compound formed is copper oxide(CuO). The equation of the reaction involved on heating copper is given below:2Cu(Shinybrownincolour)+O2Heat→2CuO(Blackincolour)

The correct option is C Copper
'X' is copper (Cu) and the black-coloured compound formed is copper oxide(CuO). The equation of the reaction involved on heating copper is given below:
$2 C u (S h i n y b r o w n i n c o l o u r) + O_{2} H e a t \to 2 C u O (B l a c k i n c o l o u r)$