DP Chemistry (first assessment 2025)

Question 20N.1A.SL.TZ0.24

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.1A.SL.TZ0.24
Level	SL	Paper	1A	Time zone	TZ0
Command term	State	Question number	24	Adapted from	N/A

24.

[Maximum mark: 1]

20N.1A.SL.TZ0.24

Which of these oxides contribute to acid deposition?

I.   ${SO}_{2}$
II.   ${NO}_{2}$
III.   ${CO}_{2}$

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

[1]

Markscheme

Examiners report

Not well answered. Less than half knew which oxides contribute to acid deposition, with the majority including CO₂ in the list. This misconception was held by higher and lower scoring candidates equally.

Syllabus sections

Structure 3. Classification of matter » Structure 3.1—The periodic table: Classification of elements » Structure 3.1.5—Metallic and non-metallic properties show a continuum. This includes the trend from basic metal oxides through amphoteric to acidic non-metal oxides. Deduce equations for the reactions with water of the oxides of group 1 and group 2 metals, carbon and sulfur.

Question 20N.1A.SL.TZ0.24

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