DP Chemistry (last assessment 2024)
Question 21M.2.hl.TZ2.b(iii)
| Date | May 2021 | Marks available | [Maximum mark: 1] | Reference code | 21M.2.hl.TZ2.b(iii) |
| Level | hl | Paper | 2 | Time zone | TZ2 |
| Command term | Deduce | Question number | b(iii) | Adapted from | N/A |
b(iii).
[Maximum mark: 1]
21M.2.hl.TZ2.b(iii)
The properties of elements can be predicted from their position in the periodic table.
Deduce, giving a reason, which complex ion [Cr(CN)6]3− or [Cr(OH)6]3− absorbs higher energy light. Use section 15 of the data booklet.
[1]
Markscheme
[Cr(CN)6]3− AND CN−/ligand causes larger splitting «in d-orbitals compared to OH−»
OR
[Cr(CN)6]3− AND CN−/ligand associated with a higher Δ/«crystal field» splitting energy/energy difference «in the spectrochemical series compared to OH− » ✓
Accept “[Cr(CN)6]3− AND «CN−» strong field ligand”.
