Give physical and chemical properties of dinitrogen.

Explanation

Physical properties : Dinitrogen is colourless, odourless, tasteless and non-toxic gas. Nitrogen atom has two stable isotopes : `""^(14)N` and `""^(15)N`
Water solubility is very low (23.2 `cm^(3)` per litre of water at 273 K and 1 bar pressure) and low freezing and boiling points.
Chemical properties : It is inert at room temperature because of high `overset(..)N -= overset(..)N` enthalpy reactivity increases with rise in temperature.
At high temperatures, it directiy combines with some metals to form predominantely ionic nitrides and with non-metals to form covalent nitrides.
For example:
`6Li + N_(2) overset(Delta) to 2Li_(3)N`
`3Mg + N_(2) overset(Delta) to Mg_(3)N_(2)`
It combines with hydrogen at about 773 K in the presence of catalyst to form ammonia.
`N_(2)(g) + 3H_(2)(g) overset(773 K) Dinitrogen combines with dioxygen only at very high temperature (about 2000 K) to form nitric oxide (NO)
`N_(2)(g) + O_(2)(g) overset(Delta)to 2NO(g)`