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Assertion and reason: potentials

Exercise and reference answers

Questions
  1. Reason
    ΔrG° equals −nF E°(cell), so a positive potential makes ΔrG° negative.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    A positive standard cell potential indicates a spontaneous reaction.
  2. Reason
    The standard hydrogen electrode is assigned a potential of zero.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Electrode potentials are quoted relative to a reference.
  3. Reason
    Molar conductivity rises on dilution.
    Verdict
    Both are true; the reason does not explain the assertion.
    Assertion
    Corrosion is electrochemical.

Explanation

The last round pairs true halves that do not explain one another. Source: syllabus Chemistry Part I, Ch 2 Electrochemistry.
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