O-LevelChemistryRates of Reaction5070/12 · May/June 2021 · Q191 Mark

Magnesium reacts with dilute sulfuric acid. Mg(s) + H2SO4(aq) → MgSO4(aq) + H2(g) Two experiments are carried out at 25 °C. experiment 1 24.0 g of powdered magnesium is reacted with 100 cm³ of 1.0 mol/dm³ sulfuric acid. experiment 2 24.0 g of powdered magnesium is reacted with 50 cm³ of 2.0 mol/dm³ sulfuric acid. During each experiment the volume of hydrogen produced is measured. The results are plotted on a graph. Which graph is correct?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

ADiagram A

BDiagram B

CDiagram C

DDiagram D

✓ Correct answer

A: Diagram A

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2021 Paper 1 Variant 2, question 19.

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