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Case study·Hard exam skill (4/5)·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 table of standard reduction potentials is given: Ag+/Ag=+0.80 V\mathrm{Ag^+/Ag}=+0.80\,\mathrm{V}, Cu2+/Cu=+0.34 V\mathrm{Cu^{2+}/Cu}=+0.34\,\mathrm{V}, Fe2+/Fe=−0.44 V\mathrm{Fe^{2+}/Fe}=-0.44\,\mathrm{V} and Zn2+/Zn=−0.76 V\mathrm{Zn^{2+}/Zn}=-0.76\,\mathrm{V}.
Total: 4 marks

(a) Identify the strongest reducing metal among Ag, Cu, Fe and Zn. (1 mark)

(b) Will Zn(s)\mathrm{Zn(s)} reduce Cu2+(aq)\mathrm{Cu^{2+}(aq)} spontaneously? (1 mark)

(c) Calculate Ecell∘E^\circ_{cell} for part (b). (1 mark)

(d) Write the strongest oxidising ion from the table. (1 mark)

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