DP Chemistry (first assessment 2025)
Question 19M.1A.HL.TZ1.8
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.HL.TZ1.8 |
| Level | HL | Paper | 1A | Time zone | TZ1 |
| Command term | Question number | 8 | Adapted from | N/A |
8.
[Maximum mark: 1]
19M.1A.HL.TZ1.8
Which electrons are removed from iron (Z = 26) to form iron(II)?
A. two 3d electrons
B. two 4s electrons
C. one 4s electron and one 3d electron
D. two 4p electrons
[1]
Markscheme
B
Examiners report
Stating the 4s electrons are lost first in forming the Fe(II) ion was done correctly by 58 % but with a low discrimination index.
Syllabus sections
Structure 3. Classification of matter » Structure 3.1—The periodic table: Classification of elements » Structure 3.1.9—The formation of variable oxidation states in transition elements can be explained by the fact that their successive ionization energies are close in value. Deduce the electron configurations of ions of the first-row transition elements.