Case study·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
Three liquids have similar molar masses. Liquid A has O-H bonds, liquid B has C-H bonds only, and liquid C has H-Cl bonds.
Total: 5 marks
(a) Which liquid is most likely to show strongest hydrogen bonding? (1 mark)
(b) Which is least likely to show strong hydrogen bonding? (1 mark)
(c) Predict the qualitative boiling-point effect for A. (3 marks)
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