O-LevelChemistryRates of Reaction5070/11 · May/June 2019 · Q181 Mark

Three experiments are carried out in which the same mass of magnesium is reacted with the same volume of dilute sulfuric acid at room temperature. The magnesium is in excess. experiment 1 Large pieces of magnesium are used. experiment 2 Small pieces of magnesium are used. experiment 3 Large pieces of magnesium are used but the concentration of the acid is increased. Graphs of the results are shown. Which row is correct?

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Aexperiment 1: W, experiment 2: X, experiment 3: Y

Bexperiment 1: X, experiment 2: Y, experiment 3: W

Cexperiment 1: Y, experiment 2: W, experiment 3: X

Dexperiment 1: Y, experiment 2: X, experiment 3: W

✓ Correct answer

D: experiment 1: Y, experiment 2: X, experiment 3: W

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2019 Paper 1 Variant 1, question 18.

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