10-minute Quiz : Chapter 14 Introduction to acids and alkalis

Which of the following statements about dilute hydrochloric acid are correct?

(1) It turns red litmus paper blue.

(2) It has a sour taste.

(3) It reacts with magnesium.

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

When solid W is added to dilute hydrochloric acid, a pale green solution and a colourless gas form. The gas can turn limewater milky. Which of the following may W be?

• A. CaCO₃(s)

• B. CaCl₂(s)

• C. FeCO₃(s)

• D. FeCl₂(s)

Which of the following are the reasons for the corrosive nature of concentrated nitric acid?

(1) It has very high acidity.

(2) It has an oxidizing property.

(3) It has a dehydrating property.

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

Refer to the following set-up. The pH paper turns blue after a while. Which of the following combinations about solutions X and Y is correct?

• A

• B

• C

• D

Which of the following statements about alkalis is INCORRECT?

• A. They are electrolytes.

• B. They react with carbonates to give carbon dioxide.

• C. They react with ammonium compounds to give ammonia.

• D. They react with acids to form salt and water.

A student carried out two tests on solutions P, Q and R respectively. The table below shows the results of the two tests. Which of the following combinations about the three solutions is correct?

• A

• B

• C

• D

Solid citric acid CANNOT turn dry blue litmus paper red because

• A. H⁺(aq) ions in solid citric acid are not mobile.

• B. solid citric acid is a covalent compound.

• C. solid citric acid contains no OH⁻(aq) ions.

• D. solid citric acid contains no H⁺(aq) ions.

An unknown compound was subjected to two tests and the results were tabulated below. Which of the following may the unknown compound be?

• A. Copper(II) carbonate

• B. Copper(II) chloride

• C. Iron(III) carbonate

• D. Iron(III) chloride

Which of the following ionic equations correctly represents the reaction between ethanoic acid and sodium carbonate solution?

• A. 2H⁺(aq) + CO₃²⁻(aq) → CO₂(g) + H₂O(ℓ)

• B. 2H⁺(aq) + Na₂CO₃(aq) → 2Na⁺(aq) + CO₂(g) + H₂O(ℓ)

• C. Na⁺(aq) + CH₃COO⁻(aq) → CH₃COONa(aq)

• D. 2CH₃COOH(aq) + CO₃²⁻(aq) → 2CH₃COO⁻(aq) + CO₂(g) + H₂O(ℓ)

Dilute sodium hydroxide solution is added to solution Z until in excess. Which of the following combinations is correct?

• A

• B

• C

• D