Selina Concise Chemistry Class 10 ICSE Solutions Study of Compounds – Nitric Acid Selina Concise Chemistry Class 10 ICSE Solutions Study of Compounds – Nitric Acid Exercise 1 Solution 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 (1part by volume) when mixed with conc. Hydrochloric acid (3 parts by volume) gives a mixture called aqua regia. It means Royal water. HNO3 +3HCl → NOCl +2H2O +2[Cl] (c) Fixation of Nitrogen: The conversion of free atmospheric nitrogen into useful nitrogenous compounds in the soil is known as fixation of atmospheric nitrogen. Solution 2. During lightning discharge, the nitrogen present in the atmosphere reacts with oxygen to form nitric oxide. The nitrogen dioxide dissolves in atmospheric moisture in the presence of oxygen of the air and forms nitric acid which is washed down by the rain and combines w...
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