Question

What is: (a) aqua fortis, (b) aqua regia (c) Fixation of Nitrogen?

Answer 1

(a) Aqua fortis: Nitric acid is called aqua fortis. Aqua fortis means strong water. It is so-called because it reacts with nearly all metals.
(b) Aqua Regia: Conc. Nitric acid ($1$ part by volume) when mixed with conc. Hydrochloric acid ($3$ parts by volume) gives a mixture called aqua regia. It means Royal water.

$HN{O}_3+3HCl⟶NOCl+2H_{2}O+2\left[Cl\right]$

(c) Fixation of Nitrogen: The conversion of free atmospheric nitrogen into useful nitrogenous compounds in the soil is known as fixation of atmospheric nitrogen