DP Chemistry (last assessment 2024)
Question 19M.1.sl.TZ1.10
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1.sl.TZ1.10 |
| Level | sl | Paper | 1 | Time zone | TZ1 |
| Command term | Question number | 10 | Adapted from | N/A |
10.
[Maximum mark: 1]
19M.1.sl.TZ1.10
Which species does not have resonance structures?
A. C6H6
B. NH4+
C. CO32−
D. O3
[1]
Markscheme
B
Examiners report
Identifying resonance structure had one of the highest discriminatory indices. Only the higher achieving candidates had much success with this.