DP Chemistry (first assessment 2025)
Question 19M.1A.HL.TZ2.30
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.HL.TZ2.30 |
| Level | HL | Paper | 1A | Time zone | TZ2 |
| Command term | Question number | 30 | Adapted from | N/A |
30.
[Maximum mark: 1]
19M.1A.HL.TZ2.30
Consider the following table of standard electrode potentials.
Which is the strongest oxidizing agent?
A. Pb2+
B. Pb
C. Al3+
D. Al
[1]
Markscheme
A
Examiners report
This was a challenging question with a high discrimination index. 57 % of the candidates identified the strongest oxidizing agent given the standard electrode potentials. The most commonly chosen distractor was Al3+ (C).
Syllabus sections
Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.2—Electron transfer reactions » Reactivity 3.2.12—The hydrogen half-cell H+(aq) + e− ⇌12 H2(g) is assigned a standard electrode potential of zero by convention. It is used in the measurement of standard electrode potential, E⦵. Interpret standard electrode potential data in terms of ease of oxidation/reduction.