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
Acetone and chloroform form a non-ideal solution. The unlike molecular attractions become stronger because of specific interaction between the two components.
Total: 4 marks
(a) State whether the solution shows positive or negative deviation from Raoult's law. (1 mark)
(b) Compare its observed vapour pressure with the ideal value. (1 mark)
(c) State the type of azeotrope expected at the extreme composition, if an azeotrope is formed. (1 mark)
(d) Give the molecular reason for the deviation. (1 mark)
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