Chemistry 5070 · 12 Experimental techniques and chemical analysis
12.5 Identification of ions and gases
Describe chemical and flame tests to identify key anions, cations, and gases, including observations and reactions.
- Questions
- 299
- Years
- 2004–2026
- Multiple choice
- 113
- Written answer
- 186
- Average marks
- 7.3
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Where this subtopic appears
- Paper 4variants 04, 41, 42120
- Paper 1variants 01, 11, 12105
- Paper 3variants 03, 31, 3240
- Paper 2variants 02, 21, 2234
Questions by year
| Year | May/June | Oct/Nov | Total |
|---|---|---|---|
| 2026 | 10 | – | 10 |
| 2023 | 10 | 12 | 22 |
| 2022 | 13 | 9 | 22 |
| 2021 | 12 | 15 | 27 |
| 2020 | 14 | 14 | 28 |
| 2019 | 12 | 9 | 21 |
| 2018 | 11 | 12 | 23 |
| 2017 | 9 | 9 | 18 |
| 2016 | 11 | 10 | 21 |
| 2015 | 8 | 6 | 14 |
| 2014 | 4 | 3 | 7 |
| 2013 | 3 | 4 | 7 |
| 2012 | 4 | 3 | 7 |
| 2011 | 3 | 4 | 7 |
| 2009 | 6 | 4 | 10 |
| 2008 | 7 | 5 | 12 |
| 2007 | 8 | 5 | 13 |
| 2006 | 5 | 8 | 13 |
| 2005 | 8 | 4 | 12 |
| 2004 | – | 5 | 5 |
