DP Chemistry (first assessment 2025)

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Question 21N.1A.HL.TZ0.31

Date	November 2021	Marks available	[Maximum mark: 1]	Reference code	21N.1A.HL.TZ0.31
Level	HL	Paper	1A	Time zone	TZ0
Command term	Predict	Question number	31	Adapted from	N/A

31.

[Maximum mark: 1]

21N.1A.HL.TZ0.31

Which aqueous solutions produce oxygen gas during electrolysis?

I. Dilute CuCl₂(aq) with inert electrodes
II. Dilute FeSO₄(aq) with inert electrodes
III. Dilute CuCl₂(aq) with copper electrodes

The standard electrode potentials are provided in the table:

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

[1]

Markscheme

A

Syllabus sections

Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.2—Electron transfer reactions » Reactivity 3.2.15—During electrolysis of aqueous solutions, competing reactions can occur at the anode and cathode, including the oxidation and reduction of water. Deduce from standard electrode potentials the products of the electrolysis of aqueous solutions.