Question

Q1. A shiny brown coloured element "X' on heating in air becomes black in
colour. Name the element 'X' and the black coloured compound formed.
OR​

Answer 1

Answer:

Element X is Copper (Cu). Black Compound formed is Copper Oxide(CuO)

The reaction takes place as follows

2Cu + O$_{2}$ --> 2Cuo

Answer 2

Answer:

the brown coloured element is copper and the black coloured is formed is called copper oxide