A concentrated aqueous solution of sodium chloride (brine) is electrolysed using inert graphite electrodes.
Which row in the table correctly identifies the products formed at the electrodes and the nature of the remaining solution?
| Product at anode | Product at cathode | Remaining solution | |
|---|---|---|---|
| A | oxygen | sodium | acidic |
| B | chlorine | hydrogen | alkaline |
| C | chlorine | sodium | neutral |
| D | oxygen | hydrogen | alkaline |
Row A
Row B
Row C
Row D
83 exam-style questions on Edexcel GCSE Chemistry 4.2 Electrolytic processes, covering 4.2.1 Electrolytes and the process of electrolysis, 4.2.2 Products of electrolysis using inert electrodes, 4.2.3 Half equations, oxidation and reduction in electrolysis, and 4.2.4 Electrolysis of copper sulfate and purifying copper. Each one has a worked solution and a mark scheme showing where the marks go.