Check sibling questions

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


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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo