10-minute Quiz : Chapter 18 Salts and neutralization

Consider the following four mixtures. Which of the statements about the mixtures are correct?

(1) A flammable gas is given out in P.

(2) Water is produced in both Q and S.

(3) The pH of R must be 7.

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

Which of the following correctly shows the sequence of steps for preparing magnesium sulphate crystals by reacting excess magnesium carbonate with dilute sulphuric acid?

• A. Crystallization, evaporation, filtration

• B. Evaporation, filtration, crystallization

• C. Filtration, crystallization, evaporation

• D. Filtration, evaporation, crystallization

Which of the following pairs of chemicals is most suitable to be used for preparing lead(II) sulphate?

• A. Lead and dilute sulphuric acid

• B. Lead(II) hydroxide and dilute sulphuric acid

• C. Lead(II) nitrate and dilute sulphuric acid

• D. Lead(II) carbonate and dilute sulphuric acid

Which of the following apparatus is NOT needed for preparing zinc sulphate crystals by the action of zinc carbonate on dilute sulphuric acid?

• A. Beaker

• B. Liebig condenser

• C. Evaporating dish

• D. Filter funnel

A sample of hydrochloric acid has a pH of 2.0. Which of the following substances, when added to the sample, would increase its pH?

(1) Water

(2) Soap solution

(3) 0.01 M ethanoic acid

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

Two of the steps involved in preparing zinc sulphate from zinc oxide are listed below:

Step I: Add zinc oxide to dilute sulphuric acid until in excess.

Step II: Filter the reaction mixture.

Which of the following combinations about the purposes of Steps I and II is correct?

• A

• B

• C

• D

Which of the following salts CANNOT be prepared by acid-alkali titration?

(1) Cu(NO₃)₂

(2) K₂SO₄

(3) ZnCl₂

• A. (1) only

• B. (2) only

• C. (1) and (3) only

• D. (2) and (3) only

A white solid is insoluble in water. When it is added to dilute hydrochloric acid, colourless gas bubbles are given out. When a small amount of aqueous ammonia is added to the resultant solution, a white precipitate forms. The precipitate dissolves in excess aqueous ammonia. Which of the following may the solid be?

• A. Aluminium nitrate

• B. Ammonium nitrate

• C. Calcium carbonate

• D. Zinc carbonate

Which of the following pairs of solutions form a white precipitate?

(1) AgNO₃(aq) and NaCl(aq)

(2) Na₂CO₃(aq) and (NH₄)₂SO₄(aq)

(3) Ba(NO₃)₂(aq) and H₂SO₄(aq)

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

In an experiment, dilute sodium hydroxide solution is added dropwise to solution X in a test tube until in excess. The graph below shows the variation of the height of precipitate appearing in the test tube. Which of the following solutions may X be?

• A. Aluminium sulphate

• B. Iron(II) sulphate

• C. Ammonium nitrate

• D. Calcium nitrate