O-LevelChemistryElectrolysis5070/11 · May/June 2021 · Q141 Mark

The diagram shows the electrolysis of concentrated and dilute aqueous sodium chloride using inert electrodes. Gases are produced and collected in each of the test-tubes W, X, Y and Z. Which statements are correct? 1 Approximately equal volumes of gas are produced and collected in test-tubes W and X. 2 Approximately equal volumes of gas are produced and collected in test-tubes Y and Z. 3 Three different gases are produced in the experiment.

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A1, 2 and 3

B1 and 2 only

C2 and 3 only

D1 and 3 only

✓ Correct answer

D: 1 and 3 only

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Topic: Electrolysis, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2021 Paper 1 Variant 1, question 14.

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