Chemistry · May / June 2021 · Paper 11 · Question 14

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.

1. A1, 2 and 3
2. B1 and 2 only
3. C2 and 3 only
4. D1 and 3 only

As printed in the paper