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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

A researcher compares four processes at constant temperature and pressure: P has ΔH<0,ΔS>0\Delta H<0,\Delta S>0; Q has ΔH>0,ΔS<0\Delta H>0,\Delta S<0; R has ΔH<0,ΔS<0\Delta H<0,\Delta S<0; S has ΔH>0,ΔS>0\Delta H>0,\Delta S>0.
Total: 5 marks

(a) Which process is spontaneous at all temperatures? (1 mark)

(b) Which process is non-spontaneous at all temperatures? (1 mark)

(c) Which process is favoured at low temperature? (1 mark)

(d) Which process is favoured at high temperature? (2 marks)

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cbse-chemistry-11.u5.t5-5.case.005

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