CAIE IGCSE Chemistry 7 Acids Bases and Salts Topic Practice

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Covered syllabus points

7.1 The characteristic properties of acids and bases7.2 Oxides7.3 Preparation of salts

Question 1

[Maximum number: 1]

Which statement about aqueous weak acids is correct?

A

Weak acids are always dilute aqueous solutions.

B

Weak acids dissociate fully in aqueous solution.

C

When a weak acid is added to blue litmus paper, it stays blue.

D

When a weak acid is added to solid magnesium, effervescence is seen.

Question 2

[Maximum number: 1]

Which oxides are basic?
1 calcium oxide
2 sodium oxide
3 iron(II) oxide

A

1, 2 and 3

B

1 and 2 only

C

2 and 3 only

D

3 only

Question 3

[Maximum number: 2]

This question is about metals.

Question (a)

(a)

Zinc oxide neutralises both acids and bases.

[ 2 ]

Question (i)

(i)

State the general name given to oxides that neutralise both acids and bases.

[ 1 ]

Question (ii)

(ii)

Name the zinc compound that forms when zinc oxide neutralises dilute sulfuric acid.

[ 1 ]

Question 4

[Maximum number: 1]

What is the colour of thymolphthalein in dilute hydrochloric acid?

A

blue

B

red

C

yellow

D

colourless

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