DP Chemistry (first assessment 2025)
Question 21N.1A.HL.TZ0.8
| Date | November 2021 | Marks available | [Maximum mark: 1] | Reference code | 21N.1A.HL.TZ0.8 |
| Level | HL | Paper | 1A | Time zone | TZ0 |
| Command term | Deduce | Question number | 8 | Adapted from | N/A |
8.
[Maximum mark: 1]
21N.1A.HL.TZ0.8
Which complex ion contains a central ion with an oxidation state of +3?
A. [PtCl6]2−
B. [Cu(H2O)4(OH)2]
C. [Ni(NH3)4(H2O)2]2+
D. [Co(NH3)4Cl2]+
[1]
Markscheme
D
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.
Structure 3. Classification of matter » Structure 3.1—The periodic table: Classification of elements » Structure 3.1.8—Transition elements have incomplete d-sublevels that give them characteristic properties. Recognize properties, including: variable oxidation state, high melting points, magnetic properties, catalytic properties, formation of coloured compounds and formation of complex ions with ligands.