A-LevelChemistryElectrochemistry9701/12 · Feb/Mar 2025 · Q111 Mark

The equation for a reaction of KClO3 is shown. 4KClO3 → KCl + 3KClO4 Which row is correct? disproportionation oxidation number reaction of chlorine in KClO4 A yes +4 B yes +7 C no +4 D no +7

Ayes +4

Byes +7

Cno +4

Dno +7

✓ Correct answer

B: yes +7

Oracle Prep sorts past-paper questions by topic, so you can drill Electrochemistry and see which topics are most likely to come up next.

Topic: Electrochemistry, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2025 Paper 1 Variant 2, question 11.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content

Which reaction is not a redox reaction?

Bromine is extracted from sea-water. In the final stages of the process two redox reactions take place. Br₂(aq) + SO₂…

Describe the trend in the reactivity of the halogens Cl2, Br2 and I₂ as oxidising agents. Explain this trend using va…

How many structural isomers are there of trichloropropane, C₃H₅Cl₃?

Many reactions take place in the engine and catalytic converter of a car. Which pair of substances is produced both b…

Structural isomerism and stereoisomerism should be considered when answering this question. 2-bromopentane is heated …