O-LevelChemistryRates of Reaction5070/12 · Oct/Nov 2021 · Q191 Mark

The apparatus shows a method of following the rate of the reaction between magnesium carbonate, MgCO3, and dilute nitric acid, HNO3. MgCO3(s) + 2HNO3(aq) → Mg(NO3)2(aq) + H2O(l) + CO2(g) The graph shows the volume of gas collected against time. Three statements are made about the experiment. 1 The mass of the flask and its contents decreases as time increases. 2 The rate of the reaction decreases as time increases. 3 The reaction has finished after four minutes. Which statements are correct?

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A1, 2 and 3

B1 and 2 only

C1 and 3 only

D2 and 3 only

✓ Correct answer

A: 1, 2 and 3

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

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