Question

a shiny brown coloured element 'X' on heating in air becomes black in colour name element x and black coloured compound formed

Answer 1

Hello friends!!

Here is your answer :

Shiny brown coloured element X is Copper ( Cu).

When element X heated in air

2Cu (s) + O2(g) ------> 2CuO (s)


Black coloured compound formed is Copper Oxide.

Hope it helps you.. ☺️☺️☺️☺️

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Answer 2

'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 + O2 -------> 2CuO

(shiny brown) (black)