Metals and their reactions with oxygen — Question Bank (Cambridge) — HIA International - Grade 7 Revision Notes & Topical Questions

Cambridge Lower Secondary Stage 8

Question 1
Paper Ref: 0620/12_Summer_2025_Q28

The diagram shows iron nails which are left for one week in separate test-tubes with the
conditions shown.
rubber stopper
oil
iron nail iron nail iron nail
water clean, dry air boiled water
1 2 3
Which test-tubes show evidence of rusting after one week?
A 1and3 B 1 only C 2and3 D 2only

Options:
A
B
C
D
Correct Key: B

Question 2
Paper Ref: 0620/22_Spring_2021_Q27

Which row describes the reactions of magnesium hydroxide and magnesium oxide?
— effect of heat on hydroxide effect of heating oxide with carbon
forms magnesium oxide magnesium and carbon dioxide formed
forms magnesium oxide no reaction
no reaction magnesium and carbon dioxide formed
no reaction no reaction

Options:
A
B
C
D
Correct Key: B

Question 3
Paper Ref: 0620/22_Winter_2009_Q31

Compound X is heated with carbon using the apparatus shown.
compound X and reaction tube
carbon
limewater
A brown solid is formed in the reaction tube and the limewater turns cloudy.
What is compound X?
A calcium oxide
B copper(II) oxide
C magnesium oxide
D
sodium oxide

Options:
A
B
C
D
Correct Key: B

Question 4
Paper Ref: 0620/23_Summer_2022_Q26

Some properties of four elements, P, Q, R and S, are shown.
Solid P reacts with dilute hydrochloric acid to give hydrogen.
Solid Q does not conduct electricity.
Solid R is used to make saucepans because it is a good conductor of heat.
Solid S reacts with oxygen to form a compound where atoms of S share electrons with
atoms of oxygen.
Which elements are metals?
A PandR B PandS C QandR D QandS

Options:
A
B
C
D
Correct Key: A

Question 5
Paper Ref: 5129/11_Summer_2024_Q21

A large piece of limestone (CaCQs) is reacted with hydrochloric acid.
Which change to the reaction conditions increases the rate of this reaction?
A
B
Cc
D
Decrease the concentration of the acid.
Decrease the temperature by 10°C.
Double the volume of acid used.
Grind up the limestone into a fine powder.

Options:
A
B
C
D
Correct Key: D

Question 6
Paper Ref: 0620/11_Summer_2024_Q25

X is a shiny silver-coloured solid at room temperature and pressure.
X is a good conductor of heat and electricity when solid.
Which statement about X is correct?
A
B
Cc
D
X is an ionic compound or a metallic element.
X is a metallic element or a non-metallic element.
X is an alloy or a metallic element.
X is an alloy or a non-metallic element.

Options:
A
B
C
D
Correct Key: C

Question 7
Paper Ref: 5129/12_Winter_2021_Q21

A more reactive metal displaces a less reactive metal from an aqueous solution of its ions.
Four unknown metals W, X, Y and Z react as shown.
W(s) + X?*(aq) no reaction
X(s) + Y**(aq) a reaction
a reaction
+5
+5
Z(s) + W'(aq) —> areaction
X(s) + Z°*(aq) >
+5
Z(s) + Y**(aq) no reaction
What is the correct order of reactivity, putting the most reactive first?
WoK3Y>Zz
Xe>W>2Z>5Y
X>YOZ5W
0 0O WwW F
Zo KOWRO>Y

Options:
A
B
C
D
Correct Key: C

Question 8
Paper Ref: 0620/21_Winter_2020_Q32

Iron can be protected from rusting by attaching a piece of a more reactive metal, e.g. magnesium,
to the iron.
Which equation represents the reaction that takes place?
A Fe(s) — Fe?*(aq) + 2e
B Fe*'(aq) + 2e > Fe(s)
C Mg(s) > Mg**(aq) + 2e
D Mg*(aq) + 2e —> Mg(s)

Options:
A
B
C
D
Correct Key: C

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