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NTA Abhyas NEET2020ChemistryElectrochemistryPractice

For the feasibility of a redox reaction in a cell, its e.m.f. should be

Options

  1. APositive
  2. BFixed
  3. CZero
  4. DNegative

Correct answer

A. Positive

Step-by-step solution

Any redox reaction would occur spontaneously if the free energy change ( Δ G ) is negative. Δ G o = - n F E o Where n is the number of electrons involved, F is the value of Faraday and E o is the cell emf. Δ G o can be negative if E o is positive.

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