At elevated temperatures

Options

A. `N_(2)`becomes increasingly reactive
B. `N_(2)`reacts with some of the transition metals
C. `N_(2)`reacts directly with elements of group `2, 13, 14` and with `H_(2)`
D. all the above are true

Answer

4

Explanation

Nitrogen consists of diatomic moleules, `N_(2)` which are extraordinary stable, not undergoing any appreciable dissociation below `3000^(@)C`. This explains the inertness of `N_(2)` which only conbines with other elements when heated.
Although `N_(2)` is rather inert,it will Combine with ` H_(2)` under pressure in the oresence of a catalyst to form ammonis and with oxygen ,when sparked to give nitrogen oxide. The former reaction is of immense industrial importance while the latter reaction takes place int he atmosphere during lighning flashes.
It will also combine with some other non-metals (like `B`and `Si` to give covalent nitrides.
Lithium and the group `2` metals combine directly with nitrogen under the right conditions to give ionic nitrides .Some transition metals also combine with the gas at red heat, if they arefinely divided to from interstitial nitrides.