A lab assistant checks these predictions before an electrolysis practical. Each solution is aqueous and is electrolysed using inert electrodes.
| Solution | Predicted product at cathode | Predicted product at anode |
|---|---|---|
| copper(II) sulfate | hydrogen | oxygen |
| potassium bromide | potassium | bromine |
| magnesium chloride | hydrogen | chlorine |
| sodium nitrate | oxygen | hydrogen |
Which prediction is correct?
Sodium nitrate
Copper(II) sulfate
Potassium bromide
Magnesium chloride
98 exam-style questions on OCR GCSE Chemistry 3.4 Electrolysis, covering 3.4.1 Products formed at the electrodes in electrolysis and 3.4.2 The technique of electrolysis. Each one has a worked solution and a mark scheme showing where the marks go.