DP Chemistry (first assessment 2025)
Question 22M.1A.SL.TZ2.21
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.1A.SL.TZ2.21 |
| Level | SL | Paper | 1A | Time zone | TZ2 |
| Command term | Identify | Question number | 21 | Adapted from | N/A |
21.
[Maximum mark: 1]
22M.1A.SL.TZ2.21
Which species could be reduced to form NO2?
A. N2
B. NO3−
C. HNO2
D. NO
[1]
Markscheme
B
Examiners report
58% of the candidates were able to identify the species that could be reduced to form NO2. The most commonly chosen distractor was HNO2.
Syllabus sections
Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.2—Electron transfer reactions » Reactivity 3.2.1—Oxidation and reduction can be described in terms of electron transfer, change in oxidation state, oxygen gain/loss or hydrogen loss/gain. Deduce oxidation states of an atom in a compound or an ion. Identify the oxidized and reduced species and the oxidizing and reducing agents in a chemical reaction.