Cambridge IGCSE · Sciences - Co-ordinated (Double) (0654)

Acids, bases and salts: Practice Questions

3 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Acids, bases and salts.

8 questions25 marksFree, no account

Question 1

1 mark

Which pair of oxides contains one acidic oxide and one basic oxide?

Question 2

1 mark

Which pair of aqueous solutions, when mixed together, will produce a precipitate of silver chloride?<\/p>

Question 3

1 mark

A student adds a few drops of methyl orange indicator to a test-tube containing dilute hydrochloric acid.
What is the resulting color of the solution?

Question 4

2 marks

State the word equation for the neutralisation reaction between dilute hydrochloric acid and sodium hydroxide solution.

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Question 5

4 marks

Outline the practical steps required to prepare a pure, dry sample of magnesium sulfate by reacting excess magnesium metal with dilute sulfuric acid.

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Question 6

6 marks

Compare the relative acidity and alkalinity of two solutions where Solution A turns universal indicator red and Solution B turns it purple, including their approximate pH values and the ions responsible for these colors.

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Question 7

4 marks

Metal oxides can be classified based on their chemical behavior.

(a) Classify copper(II) oxide as either an acidic or a basic oxide and explain your choice in terms of its reaction with acids. [2]
(b) Aluminium oxide is described as an amphoteric oxide. Define the term amphoteric and state what products are formed when aluminium oxide reacts with a base. [2]

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Question 8

6 marks

The pH scale is used to compare the relative acidity and alkalinity of aqueous solutions.

(a) Explain the difference between a strong acid and a weak acid in terms of their dissociation in water. [2]
(b) Compare the expected colors of methyl orange indicator in a solution of pH 2 and a solution of pH 10. [2]
(c) A farmer tests the soil and finds it is too acidic for certain crops. Suggest a substance the farmer could add to the soil to increase the pH and explain why this substance is suitable. [2]

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