A student electrolyses four solutions using inert electrodes and records the products.
| Solution | Product at cathode | Product at anode |
|---|---|---|
| copper(II) bromide | copper | bromine |
| sodium iodide | hydrogen | iodine |
| magnesium sulfate | magnesium | oxygen |
| silver nitrate | silver | oxygen |
Which result is not correct?
Copper(II) bromide
Sodium iodide
Magnesium sulfate
Silver nitrate
52 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.