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Electrochemistry question

2014 · Shift 1 · Q2
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Electrochemistry question

2014 · Shift 1 · Q2

JEE AdvancedChemistryElectrochemistryMultiple correct+3 / −1
In a galvanic cell, the salt bridge
  1. A
    does not participate chemically in the cell reaction.
  2. B
    stops the diffusion of ions from one electrode to another.
  3. C
    is necessary for the occurrence of the cell reaction.
  4. D
    ensures mixing of the two electrolytic solutions.
View written solutionFree

Correct answer: A, C

  1. Role of a salt bridge in a galvanic cell

    A salt bridge contains an inert electrolyte and serves mainly to:

    • maintain electrical neutrality in both half-cells,
    • complete the internal circuit by allowing ion migration,
    • minimize direct mixing of the two solutions.

  2. Evaluate each option

    A: does not participate chemically in the cell reaction.

    This is correct. The ions of the salt bridge are chosen so that they are inert with respect to the cell reaction. They help maintain charge balance but are not chemically involved in the redox reaction.

    B: stops the diffusion of ions from one electrode to another.

    This is incorrect. The salt bridge does not completely stop ion movement; rather, it allows ions to migrate to maintain electrical neutrality. It only reduces bulk mixing of the two electrolytes.

    C: is necessary for the occurrence of the cell reaction.

    This is correct. In a galvanic cell, if charge neutrality is not maintained, electron flow quickly stops. The salt bridge completes the circuit and allows the reaction to continue.

    D: ensures mixing of the two electrolytic solutions.

    This is incorrect. The salt bridge is used to prevent or minimize direct mixing of the two electrolytic solutions, not ensure it.

  3. Final answer

    The correct options are: A, C\boxed{A,\ C}A, C​

  4. Comparison with stored correct answer

    Stored answer: A,CA, CA,C

    My derived answer matches the stored answer exactly.

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