17. A shiny brown coloured element 'X' on heating in air becomes black in colour. Name the elemen 'X' and the black coloured compound formed.

17. A shiny brown coloured element 'X' on heating in air becomes black

1.	17. A shiny brown coloured element 'X' on heating in air becomes black in colour. Name the elemen 'X' and the black coloured compound formed.
Answer» is brown in COLOUR element turns BLACK on HEATING.