DP Chemistry (first assessment 2025)

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Question 20N.1A.SL.TZ0.8

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.1A.SL.TZ0.8
Level	SL	Paper	1A	Time zone	TZ0
Command term	Apply	Question number	8	Adapted from	N/A

8.

[Maximum mark: 1]

20N.1A.SL.TZ0.8

Which oxide will dissolve in water to give the solution with the lowest pH?

A. $P_{4} O_{10}$

B. ${SiO}_{2}$

C. ${Al}_{2} O_{3}$

D. $MgO$

[1]

Markscheme

A

Examiners report

Fairly well answered. Almost 70% of candidates could identify that non-metallic oxides would dissolve in water to yield a substance of low pH.

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.