DP Chemistry (first assessment 2025)
Question 19M.1A.SL.TZ1.22
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.SL.TZ1.22 |
| Level | SL | Paper | 1A | Time zone | TZ1 |
| Command term | Question number | 22 | Adapted from | N/A |
22.
[Maximum mark: 1]
19M.1A.SL.TZ1.22
Which is the species oxidized and the oxidizing agent in the reaction?
MnO2 (s) + 4HCl (aq) → MnCl2 (aq) + Cl2 (g) + 2H2O (l)
[1]
Markscheme
D
Examiners report
This question on identifying oxidizing agents was well answered by high scoring candidates, but not handled well by low scoring candidates.
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.