O-LevelChemistryRates of Reaction5070/12 · Oct/Nov 2022 · Q211 Mark

Magnesium reacts with dilute sulfuric acid. Mg(s) + H₂SO₄(aq) → MgSO₄(aq) + H₂(g) Which changes in the conditions will result in the lowest rate of production of hydrogen?

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Adecrease acid concentration, decrease solid particle size, increase temperature

Bdecrease acid concentration, increase solid particle size, decrease temperature

Cincrease acid concentration, decrease solid particle size, increase temperature

Dincrease acid concentration, increase solid particle size, decrease temperature

✓ Correct answer

B: decrease acid concentration, increase solid particle size, decrease temperature

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2022 Paper 1 Variant 2, question 21.

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