Home / iGCSE Chemistry (0620) Core:9.4 Reactivity series: Exam Style Questions Paper 1

iGCSE Chemistry (0620) Core:9.4 Reactivity series: Exam Style Questions Paper 1- New Syllabus

iGCSE Chemistry (0620) Core Paper 1 - All Chapters

Question

The table gives some information about the reactions of four metals, J, K, L and M.
What is the order of reactivity of metals J, K, L and M?
▶️ Answer/Explanation
Correct Option: A

Detailed solution:

L is definitely the most reactive because it reacts with cold water (a very vigorous reaction for metals). J reacts with steam but not cold water, putting it next. K only reacts with acid, so it’s less reactive than J. M doesn’t react with acid at all, making it the least reactive. So, the order from most to least reactive is L → J → K → M, which matches option A.

Question

Four metals, P, Q, R and S, are separately reacted with dilute hydrochloric acid. The table shows the observation for each metal.
What is the order of reactivity of these four metals, from most reactive to least reactive?
A. \(\mathrm{R}\rightarrow \mathrm{S}\rightarrow \mathrm{Q}\rightarrow \mathrm{P}\)
B. \(\mathrm{P}\rightarrow \mathrm{S}\rightarrow \mathrm{Q}\rightarrow \mathrm{R}\)
C. \(\mathrm{P}\rightarrow \mathrm{Q}\rightarrow \mathrm{S}\rightarrow \mathrm{R}\)
D. \(\mathrm{Q}\rightarrow \mathrm{R}\rightarrow \mathrm{P}\rightarrow \mathrm{S}\)
▶️ Answer/Explanation
Correct Option: C

Detailed solution:

In the reaction with dilute hydrochloric acid, bubbles are hydrogen gas, and the more bubbles produced, the faster and more vigorously the metal reacts. The faster the reaction, the more reactive the metal. So ‘lots of bubbles’ for P means it’s the most reactive, ‘few bubbles’ for Q puts it second, ‘very few bubbles’ for S means it’s reacting extremely slowly, and ‘no bubbles’ for R means it isn’t reacting at all and is the least reactive. So the order from most to least reactive is P, then Q, then S, then R, which matches option C exactly.

Question

Metal M is between zinc and iron in the reactivity series. Which statements about metal M are correct?
1. It reacts with cold water to produce hydrogen gas.
2. It does not react with cold water but will react with dilute hydrochloric acid.
3. The metal can be obtained from its oxide by heating it strongly with carbon.
4. The metal oxide cannot be reduced using carbon.
A. 1 and 3
B. 1 and 4
C. 2 and 3
D. 2 and 4
▶️ Answer/Explanation
Correct Option: C

Detailed solution:

The reactivity series order includes: …zinc, iron, hydrogen, copper… Metal M sits between zinc and iron, so it is less reactive than zinc but more reactive than iron. Metals in this region of the series do not react with cold water (statement 1 is false — only metals above magnesium react with cold water), but do react with dilute acids to produce hydrogen (statement 2 is correct). Carbon appears above zinc in the reactivity series, meaning carbon can reduce the oxides of metals below it (zinc, iron, and M) — so statement 3 is correct and statement 4 is false. The correct statements are 2 and 3 — option C.

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