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Long answer·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

For a lead storage battery during discharge, the electrode reactions may be represented as follows: at one electrode Pb+SO42−→PbSO4+2e−\mathrm{Pb+SO_4^{2-}\rightarrow PbSO_4+2e^-} and at the other PbO2+SO42−+4H++2e−→PbSO4+2H2O\mathrm{PbO_2+SO_4^{2-}+4H^++2e^-\rightarrow PbSO_4+2H_2O}.
Total: 4 marks

(a) Identify the anode reaction. (1 mark)

(b) Identify the cathode reaction. (1 mark)

(c) Write the overall discharge reaction. (1 mark)

(d) State what happens to acid concentration during discharge. (1 mark)

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cbse-chemistry-12.u2.t2-5.laq.004

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