DP Chemistry (last assessment 2024)
Question 18M.3.hl.TZ2.b.ii
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.3.hl.TZ2.b.ii |
| Level | hl | Paper | 3 | Time zone | TZ2 |
| Command term | Outline | Question number | b.ii | Adapted from | N/A |
b.ii.
[Maximum mark: 1]
18M.3.hl.TZ2.b.ii
The conductivity of a germanium semiconductor can be increased by doping.
A dye-sensitized solar cell uses a ruthenium(II)–polypyridine complex as the dye. Two ruthenium(II) complexes, A and B, absorb light of wavelengths 665 nm and 675 nm respectively.
Outline why complex B absorbs light of longer wavelength than complex A.
[1]
Markscheme
complex B has greater conjugation/delocalization
[1 mark]
