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NTA Abhyas JEE Main2020ChemistryThermodynamics (C)Practice

Which set of coditions are correct for spontaneity of a electrochemical cell reaction?

Options

  1. AΔ G = 0 , Δ E = 0
  2. BΔ G =+ v e , Δ E =+ v e
  3. CΔ G = - v e , Δ E = 0
  4. DΔ G = - v e , Δ E =+ v e

Correct answer

D. Δ G = - v e , Δ E =+ v e

Step-by-step solution

Spontaneity of cell indicates that the oxidation-reduction reaction is a spontaneous reaction for reduction at the cathode and oxidation at anode. For this Δ G must be negative. Δ G = Δ H - T Δ S ; Δ G = Δ E + P Δ V - T Δ S For spontaneity Δ G = - v e ∵ Δ G = - v e , Δ E =+ v e

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