Question

Why is laboratory prepared nitric acid is yellow in colour?

ii) Why is Conc. Nitric acid not preferred in the place of

Conc.Sulphuric acid?

iii) What is the composition of Aqua regia? Give its equations.

iv)Write the equation behind the brown ring test.​

Answer 1

Answer:

nitric acid is in yellow colour due to the dissolution of reddish brown colored nitrogen dioxide gas in acid. this gas us produced due to the thermal dissociation of a portion of nitric acid

II) nitric acid is very strong oxidising agent. it oxdizes the dihydrogen gas produce during the reaction with metal to water

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Answer 2

Sulphuric acid for the preparation of nitric acid because hydrochloric acid is volatile acid and hence nitric acid vapours will carry HCl vapours. (c) Conc. Nitric acid prepared in the laboratory is yellow in colour due to the dissolution of reddish brown coloured nitrogen dioxide gas in acid