DP Chemistry (first assessment 2025)
Question 22M.1A.HL.TZ2.8
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.1A.HL.TZ2.8 |
| Level | HL | Paper | 1A | Time zone | TZ2 |
| Command term | Deduce | Question number | 8 | Adapted from | N/A |
8.
[Maximum mark: 1]
22M.1A.HL.TZ2.8
[Cr(OH2)6]3+ is violet and [Cr(NH3)6]3+ is yellow. What is correct?
The Colour Wheel
[1]
Markscheme
B
Examiners report
61% of the candidates were able to determine the relative d-level splitting and the wavelength of light absorbed by complex ions with different ligands, given the colours of the complex ions and a colour wheel labelled with the wavelengths of light.
Syllabus sections
Structure 3. Classification of matter » Structure 3.1—The periodic table: Classification of elements » Structure 3.1.10—Transition element complexes are coloured due to the absorption of light when an electron is promoted between the orbitals in the split d-sublevels. The colour absorbed is complementary to the colour observed. Apply the colour wheel to deduce the wavelengths and frequencies of light absorbed and/or observed.