Dilute sulfuric acid is electrolysed using inert electrodes. 60 cm3\mathrm{60\,cm^{3}}60cm3 of hydrogen is collected at the cathode.
What volume of oxygen is made at the anode in the same time? Assume that none of the gas dissolves.
15 cm3\mathrm{15\,cm^{3}}15cm3
30 cm3\mathrm{30\,cm^{3}}30cm3
60 cm3\mathrm{60\,cm^{3}}60cm3
120 cm3\mathrm{120\,cm^{3}}120cm3
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.