Solution A is a strong acid.
Solution B is a weak acid.
Solution C is a strong alkali.
(i) Which solution contains solute molecules in addition to water molecules?
(ii) Which solution will give a gelatinous white precipitate with zinc sulphate solution? The precipitate disappears when an excess of the solution is added.
(iii) Which solution could be a solution of glacial acetic acid?
(iv) Give an example of a solution which is a weak alkali.

Open in App

Solution

(i) Solution B contains solute molecules in addition to water molecules, as a weak acid ionises partially.

(ii) Solution C gives a gelatinous white precipitate with zinc sulphate solution that disappears when an excess of solution C is added. For example, sodium hydroxide (strong alkali) reacts with zinc sulphate to form a gelatinous white precipitate of zinc hydroxide.
2NaOH + ZnSO₄ → Na₂SO₄ + Zn(OH)₂(↓)

(iii) Solution B could be a solution of glacial acetic acid as it a weak acid.

(iv) Magnesium hydroxide is a weak alkali, as it has low solubility in water.

Suggest Corrections

Similar questions

Q. Solution A is a sodium hydroxide solution. Solution B is a weak acid. C is dilute sulphuric acid. Which solution will
(i) liberate sulphur dioxide from sodium sulphite,
(ii) give a white precipitate with zinc sulphate solution,
(iii) contain solute molecules and ions?

Q. 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 solution 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?

A black colored compound (A) on reaction with

d i l . H_{2} S O_{4}

gives a gas (B) which on passing in a solution of acid (C) gives white turbidity (D). Gas (B) when passed in an acidified solution of a compound (E) gives a black precipitate (F) which is soluble in hot concentrated (C). After boiling this solution when an excess of ammonia solution is added, a blue-colored compound (G) is formed. To the solution of (E), on the addition of acetic acid and aqueous potassium ferrocyanide, a chocolate brown precipitate (H) is formed. On the addition of an aqueous solution of

B a C l_{2}

to an aqueous solution of (E), white precipitate insoluble in

H N O_{3}

is obtained.

The gas (B) on passing through an acid (C) gives white turbidity (D) because :

Q. Select the correct answer from the choices a. b, c and d which are given.
Write only the letter corresponding to the correct answer.
(i) A particular solution contains molecules and ions of the solute so it is a
(a) weak acid
(b) strong acid
(c) strong base
(d) salt solution

(ii) An organic weak acid is
(a) Formic acid
(b) Sulphuric acid
(c) Sulphuric base
(d) Hydrochloric acid

(iii) An example of a complex salt is
(a) Zinc sulphate
(b) Solution hydrogen sulphate
(c) Iron (II) ammonium sulphate
(d) Tetramine copper (II) sulphate

On adding dilute ammonia solution to a colourless solution of a salt, a white gelatinous precipitate appears. This precipitate, however, dissolves on the addition of an excess of ammonia solution. Identity (choose from Na, Al, Zn, Pb, Fe)
(a) Which metal salt solution was used?
(b) What is the formula of the white gelatinous precipitate obtained?

Join BYJU'S Learning Program