Q.17: A shiny brown coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black coloured compound formed.

Q.17: A shiny brown coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black coloured compound formed. | Unit1 Chemistry NCERT solution-Grade-10

Answer:-

The shinny brown colored element ‘X’ is copper. When it is heated in air, it becomes black due to the deposit of copper oxide.