Question

A shiny brown coloured element X' on heating in air becomes black in
colour. Name the element X' and the black compound formed.
i
mbo 21 31on the basis of your understanding 01
A​

Answer 1

Answer:

Shiny brown coloured element "X" is Copper on heating in air it forms Copper oxide which is black in colour.

i.e.

2Cu + O2 - 2CuO

Answer 2

Answer:

X is Copper(Cu) and the black compound is Copper oxide(CuO).