A student electrolyses solutions of the chlorides of three metals, X, Y and Z, using inert electrodes. The table shows the product at the cathode.
| Solution | Product at cathode |
|---|---|
| X chloride | X |
| Y chloride | hydrogen |
| Z chloride | Z |
Which conclusion is correct?
X and Z are less reactive than hydrogen, and Y is more reactive than hydrogen.
The order of reactivity, from most to least reactive, is Y, X, Z.
Y is less reactive than hydrogen, because hydrogen is made instead of Y.
X, Y and Z are all less reactive than hydrogen, because chlorine is made at the anode each time.
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.