9.2 Nitric Acid — Chemistry STD 10 — Question

The questions (i) to (v) refer to the following salt solutions listed (a) to (f):
(a) Copper nitrate
(b) Iron (II) sulphate
(c) Iron (III) chloride
(d) Lead nitrate
(e) Magnesium sulphate
(f) Zinc chloride
(i) Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution ?
(ii) Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution ?
(iii) Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
(iv) Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it ?
(v) Which solution gives a white precipitate with excess ammonium hydroxide solution?

Give an equation for preparation of HCl gas by synthesis. State two conditions involved in its synthesis.

Explain the following:
(a) Almost 90% of all known compounds are organic in nature.
(b) It is dangerous to burn methane in an insufficient supply of air.

Give balanced chemical equation for the following :
(a) Ammonia and oxygen in the presence of catalyst.
(b) Oxidation of carbon with concentrated nitric acid.

Give one test to distinguish between the following pair of chemicals.
Sodium nitrate solution and sodium chloride solution.

Give reason for the following:
Nitric acid can be stored in aluminium containers.