Chemistry 9701 · 11 Group 17
11.4 The reactions of chlorine
Describe chlorine disproportionation with hot/cold NaOH and its use in water purification.
- Questions
- 63
- Years
- 2015–2026
- Multiple choice
- 52
- Written answer
- 11
- Average marks
- 3
Where this subtopic appears
- Paper 1variants 11, 12, 13, 1452
- Paper 2variants 21, 22, 237
- Paper 4variants 42, 433
- Paper 3variants 331
Questions by year
| Year | Feb/March | May/June | Oct/Nov | Total |
|---|---|---|---|---|
| 2026 | – | 3 | – | 3 |
| 2023 | – | 3 | 2 | 5 |
| 2022 | 1 | 2 | 3 | 6 |
| 2021 | 1 | 4 | 2 | 7 |
| 2020 | 1 | 1 | 1 | 3 |
| 2019 | 1 | 5 | 5 | 11 |
| 2018 | 2 | 3 | 3 | 8 |
| 2017 | 2 | 4 | 3 | 9 |
| 2016 | 1 | 2 | 1 | 4 |
| 2015 | – | 4 | 3 | 7 |
