DP Chemistry (first assessment 2025)
Question 19M.1A.SL.TZ2.6
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.SL.TZ2.6 |
| Level | SL | Paper | 1A | Time zone | TZ2 |
| Command term | Question number | 6 | Adapted from | N/A |
6.
[Maximum mark: 1]
19M.1A.SL.TZ2.6
Which transition in the hydrogen atom emits visible light?
A. n = 1 to n = 2
B. n = 2 to n = 3
C. n = 2 to n = 1
D. n = 3 to n = 2
[1]
Markscheme
D
Examiners report
This question discriminated well between high scoring and low scoring candidates. 68% of the candidates chose the correct transition that emits visible light (n = 3 to n = 2). The most commonly chosen distractor C was the only other option that involved emission.
Syllabus sections
Structure 1. Models of the particulate nature of matter » Structure 1.3—Electron configurations » Structure 1.3.2—The line emission spectrum of the hydrogen atom. The line emission spectrum of hydrogen provides evidence for the existence of electrons in discrete energy levels, which converge at higher energies. Describe the emission spectrum of the hydrogen atom, including the relationships between the lines and energy transitions to the first, second and third energy levels.