DP Chemistry (first assessment 2025)

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Question 19M.2.SL.TZ2.3c

Date	May 2019	Marks available	[Maximum mark: 1]	Reference code	19M.2.SL.TZ2.3c
Level	SL	Paper	2	Time zone	TZ2
Command term	Suggest	Question number	c	Adapted from	N/A

c.

[Maximum mark: 1]

19M.2.SL.TZ2.3c

(c)

Suggest why it is surprising that dinitrogen monoxide dissolves in water to give a neutral solution.

[1]

Markscheme

oxides of nitrogen/non-metals are «usually» acidic [✔]

Examiners report

Only a quarter of the candidates answered correctly. Some simply stated that N₂O forms HNO₃ with water which did not gain the mark.

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.