| Date | November 2017 | Marks available | 1 | Reference code | 17N.1.hl.TZ0.10 |
| Level | HL | Paper | 1 | Time zone | TZ0 |
| Command term | Question number | 10 | Adapted from | N/A |
Question
[CoCl6]3– is orange while [Co(NH3)6]3+ is yellow. Which statement is correct?
A. [CoCl6]3– absorbs orange light.
B. The oxidation state of cobalt is different in each complex.
C. The different colours are due to the different charges on the complex.
D. The different ligands cause different splitting in the 3d orbitals.
Markscheme
D
Examiners report
[N/A]
Syllabus sections
Additional higher level (AHL) » Topic 13: The periodic table—the transition metals » 13.2 Coloured complexes
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