Question

A shiny brown coloured element ‘X’ on heating in air becomes black in colour. Name
the element ‘X’ and the black coloured compound formed. What happens when hydrogen gas is passed over the black coloured compound? Write balanced equations for both the reactions.

Answer 1

Answer:

X - copper is shiny brown coloured compound

Answer 2

Answer:

the element X is copper.

the black coloured compound form is CuO.

1st reaction

Cu + O2 ---- CuO

2nd

CuO + H2 ----- Cu + H2O