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JEE Advanced · 2014 · 25 May 2014 · Paper 1 · Redox Reactions and Electrochemistry

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In a galvanic cell, the salt bridge
  1. (A)does not participate chemically in the cell reaction.✓ Correct
  2. (B)stops the diffusion of ions from one electrode to another.
  3. (C)is necessary for the occurrence of the cell reaction.✓ Correct
  4. (D)ensures mixing of the two electrolytic solutions.

Answer: (A), (C)

Solution

The salt bridge does not take part in the chemical cell reaction (A, true) and is required to maintain electrical neutrality in the two half-cells and complete the circuit, without which the reaction cannot proceed (C, true). It permits regulated ion migration (it does not stop diffusion, so B is false) while keeping the two electrolyte solutions from mixing (D false).

JEE Advanced · 2014 · 25 May 2014 · Paper 1 · One or more correct options

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