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


  1. Class 10
  2. Chapter 1 Class 10 - Chemical Reactions and Equations (Term 1)

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo