Select the letters A, B, C, D or E, which form the gaseous products of the reactions from 1 to 5.

A: Nitrogen dioxide only
B: Nitric oxide only
C: Hydrogen
D: Nitrogen dioxide and oxygen
E: Nitrogen dioxide and carbon dioxide.

1. Reaction of manganese with cold, very dil. nitric acid.
2. Reaction of sulphur with conc. nitric acid.
3. Reaction of zinc with dil. nitric acid.
4. Reaction of carbon with conc. nitric acid.
5. Heat on nitric acid.

Select the correct word from the list in bracket to complete each statement.

1. The oxidised product obtained on reaction of H₂S gas with dil. HNO₃ is ……………. [sulphur dioxide / sulphur / sulphuric acid].
2. Aqua regia is a mixture of one part of …………… and three parts of …………… [conc. hydrochloric acid / conc. nitric acid] in which nitric acid …………… [reduces/oxidises] hydrochloric acid to chlorine.
3. Pure conc. nitric acid or fuming nitric acid renders the metal …………… [zinc/copper/iron] passive or inactive.
4. A mineral acid obtained from conc. nitric acid on reaction with a non-metal is …………… [hydrochloric acid / sulphuric acid / carbonic acid].
5. The reaction of …………… [calcium carbonate / calcium oxide / calcium sulphite] with dilute nitric acid is an example of a neutralization reaction.

Name the oxidised product when the following 1 to 5 react with nitric acid

1. Sulphur [with conc. acid]
2. Zinc [with dil. acid]
3. Aqueous soln. of SO₂ [with dil. acid]
4. Acidified iron [II] sulphate [with dil. acid]
5. Carbon [with conc. acid]

Give reasons for the following:

Nitric acid is not manufactured from atmospheric nitrogen.