Question

1: a salt which is insoluble in nitric acid but soluble in ammonia solution

2: a substance obtained when a basic gas reacts with HCl gas

3: a salt obtained by the action of active metals with dilute HCl

4: a salt obtained by dissolving in soluble metallic chlorides in excess of ammonium hydroxide

5: a salt which evolves hydrogen sulphide with HCl

6: a compound which on treatment with HCl leaves a yellow residue behind

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Answer 1

Answer:

1)- Lead carbonate is dissolved in dilute nitric acid and then ammonium hydroxide is added to it. A white precipitate is formed which is insoluble in excess

2) - The HCl gas reacts with vapours of ammonium hydroxide to form very fine solid particles of ammonium hydroxide which are white in colour. These white particles of solid ammonium hydroxide appear in the form of white fumes.

3) - Metals on reaction with acid result in the formation salt and hydrogen gas.

5) - HCl results in the formation of sodium chloride with the liberation of carbon dioxide gas. Sodium sulphite on treating with dil. HCl results in the formation of sodium chloride with the liberation of sulphur dioxide gas.

6) - Upon mixing of concentratedhydrochloric acid and concentrated nitric acid, chemical reactionsoccur. These reactions result in the volatile products nitrosyl chloride and chlorine gas: HNO3 (aq) + 3 HCl (aq) → NOCl (g) + Cl2 (g) + 2 H2O. as evidenced by the fuming nature and characteristic yellow color of aqua regia.