Question

A shiny brown coloured element​ X on heating in air become black in color
name the element X and the black color compound formed
​

Answer 1

the element x is copper and on heating it becomes copper oxids

Answer 2

HELLO DEAR FRIEND

The element X is

$\large \bf \it \boxed{copper}$

and the black coloured compound is

$\large \underline{copper \: oxide}$.The equation of the reaction is given below :--

heat

2Cu. + O2 ----------> CuO

(shiny brown. (black in colour)

in colour)

HOPE IT HELPS YOU DEAR FRIEND THANKS