1
1 mark
The diagrams below show some of the uses of iron.
In which of these uses is iron most likely to rust?
Option A
Option B
Option C
Option D
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Reactivity Series & Corrosion of Metals (Cambridge (CIE) IGCSE Chemistry): Exam Questions
Exam code: 0620 & 0971
4 hours41 questions
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2
1 mark
A student prepared four iron nails as explained below in an experiment to investigate rusting. She allowed the nails to rest in individual test tubes in a laboratory for one week.
Which nail will show the greatest amount of rust?
Dipped in water and allowed to dry.
Dipped in paint and allowed to dry.
Coated in grease.
Galvanised with zinc.
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3
1 mark
The diagram shows the experimental set-up a student used to investigate the composition of air. The student left the apparatus in the laboratory and observed that the water level had risen inside the test tube after one week.
Which statement explains why the water level rose?
Nitrogen monoxide was produced.
Iron oxide was produced.
The temperature of the water increased.
Sulfur dioxide was produced.
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4
1 mark
Extended Only
A student observed the reaction between copper(II) sulfate solution and zinc.
Which observations are correct for this reaction?
| Observation 1 | Observation 2 |
A | solution colour stays the same | pale grey crystals forming |
B | solution turns darker blue | grey residue on the metal |
C | solution turns orange/brown | blue crystals form on the metal |
D | solution turns paler blue | orange / brown residue on the metal |
Option A
Option B
Option C
Option D
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5
1 mark
A student was investigating the reactivity of four different metals, W, X, Y and Z, in hydrochloric acid.
Which is the most reactive metal and which is the least reactive metal?
| Most reactive metal | Least reactive metal |
A | W | X |
B | X | W |
C | Y | X |
D | W | Z |
Option A
Option B
Option C
Option D
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6
1 mark
W, X, Y and Z are metals.
A student investigates the reactivity of these elements with dilute hydrochloric acid. The table shows the observations at room temperature.
metal | observation |
W | Slow reaction |
X | Violent reaction |
Y | Very slow reaction |
Z | No reaction |
Which row correctly identifies W, X, Y and Z?
W | X | Y | Z | |
A | iron | potassium | silver | aluminium |
B | iron | potassium | aluminium | silver |
C | aluminium | potassium | iron | silver |
D | aluminium | potassium | silver | iron |
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7
1 mark
Which word equation represents the rusting of iron?
iron + water + hydrogen → hydrated iron(III) oxide
iron + water + oxygen → hydrated iron(III) oxide
iron + water + hydrogen → hydrated iron(II) oxide
iron + water + oxygen → hydrated iron(II) oxide
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1
1 mark
Compound Y is thermally decomposed with carbon using the apparatus below:
A brown solid is formed in the reaction tube and the limewater turns cloudy.
What is compound Y?
Copper (II) oxide
Calcium oxide
Magnesium oxide
Sodium oxide
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2
1 mark
Calcium, copper, iron and magnesium are metals. They can be placed in order of reactivity.
Which of the following statements about these metals is correct?
Iron reacts with steam but magnesium does not.
Copper reacts with dilute hydrochloric acid to form copper (II) chloride.
Magnesium and calcium both react with hot water.
Iron (II) oxide cannot be reduced by heating strongly with carbon.
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3
1 mark
Which row in the table below shows how the metal will react?
| metal | reacts with dilute acid | reacts rapidly with cold water | reacts with steam |
A | copper |
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B | calcium |
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C | zinc |
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D | magnesium |
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Option A
Option B
Option C
Option D
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4
1 mark
Q, R and S are metals.
Metal | Reacts with cold water | Reacts with steam | Reacts with dilute hydrochloric acid |
Q | yes | yes | violently |
R | very slowly | slowly | less strongly |
S | no | no | no |
What are the possible identities of the metals Q, R and S?
| Q | R | S |
A | Potassium | Iron | Magnesium |
B | Sodium | Zinc | Copper |
C | Silver | Aluminium | Iron |
D | Calcium | Copper | Gold |
Option A
Option B
Option C
Option D
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5
1 mark
A student was investigating the reactivity of different metals in hydrochloric acid.
The diagrams show what happens when each metal was added to dilute hydrochloric acid.
What are W, X, Y and Z?
| W | X | Y | Z |
A | Calcium | Copper | Magnesium | Zinc |
B | Copper | Zinc | Calcium | Magnesium |
C | Magnesium | Calcium | Zinc | Copper |
D | Zinc | Magnesium | Copper | Calcium |
Option A
Option B
Option C
Option D
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6
1 mark
A student investigates the reactivity of four different metals by adding a small piece of each metal to separate test-tubes containing aqueous iron(II) chloride.
A tick (✓) indicates a reaction occurs. A cross (×) indicates no reaction occurs.
Which row correctly predicts the results of the student's investigation?
copper | magnesium | aluminium | zinc | |
A | × | ✓ | ✓ | ✓ |
B | ✓ | × | × | × |
C | × | ✓ | × | ✓ |
D | × | ✓ | ✓ | × |
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1
1 mark
Reactions of three metals and their oxides are shown in the table.
metal | reacts with cold water | metal oxide reacts with carbon |
P | no | no |
Q | no | yes |
R | yes | no |
What is the order of reactivity of the metals?
| Least reactive | → | Most reactive |
A | P | Q | R |
B | Q | P | R |
C | Q | R | P |
D | R | P | Q |
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2
1 mark
Five different metals P, Q, R, S and T were reacted with dilute hydrochloric acid.
The volume of hydrogen gas produced after one minute was measured. The results are shown in the bar chart below:
What is the order of reactivity of the metals?
| most reactive | → | → | → | least reactive |
A | P | Q | R | S | T |
B | R | P | S | Q | T |
C | T | Q | S | P | R |
D | T | S | R | Q | P |
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3
1 mark
The following section of the reactivity series shows a newly discovered element, Y. The only oxide of Y has the formula YO.
Ca
Mg
Fe
Y
H
Cu
Which of the equations shows a reaction which would take place?
2 Y(s) + Cu2+(aq) → 2 Y+(aq) + Cu(s)
Y(s) + Fe2O3(s) → 2 Fe(s) + 3 YO(s)
Y(s) + 2 HCl (aq) → YCl2(aq) + H2(g)
Cu(s) + Y2+(aq) → Cu2+(aq) + Y(s)
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4
1 mark
Four different metals P, Q, R and S were added to different aqueous solutions of their ions.
The results are shown in the table below.
Metal | P2+ | Q2+ | R2+ | S2+ |
P | ✗ | ✗ | ✓ | ✓ |
Q | ✓ | ✗ | ✓ | ✓ |
R | ✗ | ✗ | ✗ | ✗ |
S | ✗ | ✗ | ✓ | ✗ |
Key: ✗ = no reaction, ✓ = reaction
What is the order of reactivity of the metals from most reactive to least reactive?
| most reactive | → | → | least reactive |
A | Q | P | S | R |
B | Q | S | P | R |
C | R | P | S | Q |
D | R | S | P | Q |
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5
1 mark
Small blocks of zinc are attached to ship hulls which are commonly made from steel, an alloy of iron. This is done to prevent the hull from rusting.
Which statement explains this process?
Zinc is higher up on the reactivity series than iron so has a higher tendency to become reduced.
Zinc is lower down on the reactivity series than iron so has a higher tendency to become reduced.
Zinc is higher up on the reactivity series than iron so has a higher tendency to become oxidised.
Zinc is lower down on the reactivity series than iron so has a higher tendency to become oxidised.
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