DP Chemistry (first assessment 2025)

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Question 21M.1A.HL.TZ1.9

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.1A.HL.TZ1.9
Level	HL	Paper	1A	Time zone	TZ1
Command term	Deduce	Question number	9	Adapted from	N/A

9.

[Maximum mark: 1]

21M.1A.HL.TZ1.9

What is the overall charge, $x$ , of the chromium (III) complex?

$[Cr (H_{2} O)_{4} {Cl}_{2}]^{x}$

A. 0

B. 1+

C. 2−

D. 3+

[1]

Markscheme

B

Syllabus sections

Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.4—Electron-pair sharing reactions » Reactivity 3.4.8—Coordination bonds are formed when ligands donate an electron pair to transition element cations, forming complex ions. Deduce the charge on a complex ion, given the formula of the ion and ligands present.