Dinitrogen is commercially prepared by

Options

A. the action of alkaline hypobromite solution on urea
B. the oxidation of `NH_(3)`by passing it over heated copper oxide.
C. fractional distillation of liquefied air
D. heating barium aside

Answer

3

Explanation

`N_(2)` is obtained commercially by condensing air to the liquid state and then fractionally distilling the liquid air.`N_(2)` has a lower boiling point than `O_(2)` ( the boiling point of liquids `N_(2)` and liquid `O_(2)` are `-196^(@)C`amd `-183^(@)` respectively)and therefore molecular nitrogen will boil off before molecular oxygen does during the fractional distillation of liquid air. Six industrial gases are obtained in this way: `N_(2), O_(2), Ne, Ar, kr` and `Xe`.