DP Chemistry (last assessment 2024)

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Question 22N.1.sl.TZ0.22

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1.sl.TZ0.22
Level sl Paper 1 Time zone TZ0
Command term Apply Question number 22 Adapted from N/A
22.
[Maximum mark: 1]
22N.1.sl.TZ0.22

Which substance is the reducing agent in the given reaction?

H+ (aq) + 2H2O (l) + 2MnO4− (aq) + 5SO2 (g) → 2Mn2+ (aq) + 5HSO4− (aq)


A.  H+

B.  H2O

C.  MnO4−

D.  SO2

[1]

Markscheme

D

Examiners report

50% of the candidates identified SO2 as the reducing agent. The most commonly chosen distractor was MnO4−. The question had good discrimination between high-scoring and low-scoring candidates.

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