DP Chemistry (first assessment 2025)
Question 21M.1A.HL.TZ2.11
| Date | May 2021 | Marks available | [Maximum mark: 1] | Reference code | 21M.1A.HL.TZ2.11 |
| Level | HL | Paper | 1A | Time zone | TZ2 |
| Command term | Deduce | Question number | 11 | Adapted from | N/A |
11.
[Maximum mark: 1]
21M.1A.HL.TZ2.11
What is the formula of the compound formed from Ca2+ and PO43−?
A. CaPO4
B. Ca3(PO4)2
C. Ca2(PO4)3
D. Ca(PO4)2
[1]
Markscheme
B
Syllabus sections
Structure 2. Models of bonding and structure » Structure 2.1—The ionic model » Structure 2.1.2—The ionic bond is formed by electrostatic attractions between oppositely charged ions. Deduce the formula and name of an ionic compound from its component ions, including polyatomic ions. Binary ionic compounds are named with the cation first, followed by the anion. The anion adopts the suffix “ide”. Interconvert names and formulas of binary ionic compounds.