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

The neutral oxide of nitrogen is

Mole fraction of nitrogen in air is

Which oxides of nitrogen are neutral oxides ?

Percentage of nitrogen in air by volume………….

Which of the following oxides of nitrogen is a brown coloured gas?

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 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?

How are oxides of nitrogen harmful to ozone concentration?

Among the oxides of nitrogen, a brown coloured gas is