DP Chemistry (first assessment 2025)

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Question 21M.1A.SL.TZ2.9

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.1A.SL.TZ2.9
Level	SL	Paper	1A	Time zone	TZ2
Command term	Deduce	Question number	9	Adapted from	N/A

9.

[Maximum mark: 1]

21M.1A.SL.TZ2.9

Which compound has the greatest volatility under the same conditions?

A. SO₂

B. SiO₂

C. SnO₂

D. SrO

[1]

Markscheme

A

Syllabus sections

Structure 2. Models of bonding and structure » Structure 2.2—The covalent model » Structure 2.2.9—Given comparable molar mass, the relative strengths of intermolecular forces are generally: London (dispersion) forces < dipole–dipole forces < hydrogen bonding. Explain the physical properties of covalent substances to include volatility, electrical conductivity and solubility in terms of their structure.