Reactivity series — KCSE Chemistry

KCSE Chemistry · 51 practice questions · 4 syllabus objectives

20 easy20 medium11 hard

What You'll Learn

Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.

State the order of metals in the reactivity series and relate it to their reactivity with water and acids

Explain displacement reactions between metals and salt solutions using the reactivity series

Predict whether a displacement reaction will occur between a given metal and metal salt solution

Reactivity series

Sample Questions

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1
easySHORT ANSWER2 marks

State two reasons why magnesium can displace zinc from zinc sulfate solution. (2 marks)

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Part (a) — 2 marks
Magnesium is higher than zinc in the reactivity series (1 mk)
Magnesium has a greater tendency to lose electrons than zinc (1 mk)
2
easySHORT ANSWER3 marks

List three metals that will displace copper from copper(II) sulfate solution. (3 marks)

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Part (a) — 3 marks
Zinc (Zn) (1 mk)
Aluminium (Al) (1 mk)
Iron (Fe) (1 mk)
3
easySHORT ANSWER4 marks

State the position of magnesium in the reactivity series and explain its ability to displace lead from lead(II) nitrate solution. (4 marks)

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Part (a) — 2 marks
Magnesium is positioned above lead in the reactivity series (1 mk)
This indicates that magnesium is more reactive than lead (1 mk)
Part (b) — 2 marks
Magnesium can lose electrons more readily than lead (1 mk)
Thus, it can displace lead ions from the lead(II) nitrate solution (1 mk)
4

State two metals that can displace copper from copper(II) sulfate solution and explain why they are able to do so. (4 marks)

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Why Practise Reactivity series?

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