O-LevelChemistryRates of Reaction5070/12 · May/June 2018 · Q191 Mark

Compound X reacts with an acid to produce sulfur dioxide gas. A sample of X is placed in a flask and acid is added. The sulfur dioxide produced is collected and its volume is measured at various times. A graph of the results is plotted. Which statement about this experiment is correct?

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AThe gas can be collected by displacing water from a measuring cylinder.

BThe mass of the reaction flask and its contents decreases as the reaction proceeds.

CThe rate of the reaction increases as time increases.

DThe reaction is still proceeding after eight minutes.

✓ Correct answer

B: The mass of the reaction flask and its contents decreases as the reaction proceeds.

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2018 Paper 1 Variant 2, question 19.

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