O-LevelChemistryRates of Reaction5070/12 · May/June 2015 · Q191 Mark

In the graph, curve 1 was obtained by observing the decomposition of 100cm³ of 1.0mol/dm³ hydrogen peroxide solution, catalysed by manganese(IV) oxide. 2H₂O₂ → 2H₂O + O₂ Which alteration to the original experimental conditions would produce curve 2?

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Aadding some 0.1 mol/dm³ hydrogen peroxide solution

Blowering the temperature

Cusing less manganese(IV) oxide

Dusing a different catalyst

✓ Correct answer

A: adding some 0.1 mol/dm³ hydrogen peroxide solution

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2015 Paper 1 Variant 2, question 19.

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