DP Chemistry (first assessment 2025)
Question 22M.2.SL.TZ2.5b
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.SL.TZ2.5b |
| Level | SL | Paper | 2 | Time zone | TZ2 |
| Command term | Calculate | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 1]
22M.2.SL.TZ2.5b
(b)
Calculate the oxidation state of sulfur in iron(II) disulfide, FeS2.
[1]
Markscheme
–1 ✔
Accept “– I”.
Examiners report
This was an easy question, yet 30% of the candidates were unable to work it out; some wrote the oxidation state in the conventionally incorrect format, 1- and lost the mark.
Syllabus sections
Structure 3. Classification of matter » Structure 3.1—The periodic table: Classification of elements » Structure 3.1.6—The oxidation state is a number assigned to an atom to show the number of electrons transferred in forming a bond. It is the charge that atom would have if the compound were composed of ions. Deduce the oxidation states of an atom in an ion or a compound.