Cambridge IGCSE · Chemistry (0620)

The characteristic properties of acids and bases: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on The characteristic properties of acids and bases.

10 questions24 marksFree, no account

Question 1

1 mark

What color change is observed when a few drops of methyl orange indicator are added to a solution of dilute hydrochloric acid?

Question 2

1 mark

Which products are formed when ammonium chloride is warmed with aqueous calcium hydroxide?

Question 3

1 mark

Equal volumes of $0.1\text{ mol/dm}^3$ hydrochloric acid and $0.1\text{ mol/dm}^3$ ethanoic acid are neutralised by $0.1\text{ mol/dm}^3$ sodium hydroxide. Which statement is correct?

Question 4

1 mark

Which gas is produced when dilute nitric acid reacts with solid calcium carbonate?

Question 5

1 mark

A student warms an unknown colorless solution with aqueous sodium hydroxide. A gas is evolved that turns damp red litmus paper blue. Which ion is present in the solution?

Question 6

2 marks

Write the ionic equation that represents the neutralisation reaction between any strong acid and any strong alkali, including state symbols.

Write your answer out first, then check it against the worked solution.

Question 7

3 marks

When an alkali is warmed with an ammonium salt, what gas is produced, and what is the characteristic test result for this gas?

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Question 8

5 marks

In the following reversible reaction, identify which reactant acts as the proton donor according to the Brønsted-Lowry theory:
$NH_3(aq) + H_2O(l) \rightleftharpoons NH_4^+(aq) + OH^-(aq)$.

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Question 9

4 marks

Dilute sulfuric acid, $$ \text{H}_2\text{SO}_4 $$ , is a strong acid with characteristic properties.

Write a balanced symbol equation for the reaction of dilute sulfuric acid with each of the following substances. Include state symbols where appropriate.

(a) Zinc metal ( $$ \text{Zn} $$ )

(b) Aqueous sodium hydroxide ( $$ \text{NaOH} $$ )

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Question 10

5 marks

A student tested two different solutions, Solution X and Solution Y, using universal indicator paper. Solution X turned the paper red ( $$ \text{pH}=2 $$ ) and Solution Y turned the paper blue ( $$ \text{pH}=10 $$ ).

(a) State the ion responsible for the acidic property of Solution X and the ion responsible for the alkaline property of Solution Y.

(b) Solution X is a strong acid and Solution Y is a strong alkali. Both solutions have the same concentration ( $$ 0.1 \text{mol}/\text{dm}^3 $$ ).

i) Which solution has a higher concentration of hydrogen ions ( $$ \text{H}^+ $$ )?

ii) Describe the colour change you would observe if Solution X was slowly added to Solution Y until neutralisation was complete, monitored using universal indicator paper.

(c) Write the balanced ionic equation, including state symbols, for the neutralisation reaction between Solution X and Solution Y.

Write your answer out first, then check it against the worked solution.

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