A shiny brown coloured element ‘X’ on heating in air becomes black in colour.
Name the element ‘X’ and the black coloured compound formed.
Copper is a shiny brown coloured element.
It gets oxidised to CuO , which is a black coloured substance , on reaction with Oxygen present in air.
Hence, the substance ‘X’ is Copper (Cu).
The black coloured compound is CuO (Copper Oxide) formed by the following reaction;
2Cu + O 2 → 2CuO