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

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

A shiny brown coloured element x on heating in air becomes black in colour name the element x and the blacked coloured compound formed

A shiny brown coloured element 'X' on heating in air becomes black in colour. Can you predict the element 'X' and the black coloured substance formed? How do you support your predictions?

A colour less oxide of nitrogen in air becomes brown. Why?

Which of the following salts are black in colour?

Why do transition elements form coloured compounds ?

Why do the transition elements form coloured compounds?

Why does a black board appears black in colour ?