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For a cell reaction involving a two-electron change, the standard e.m.f. of the cell is found to be 0.295 ~V at 25^ C . The equilibrium constant of the reaction at 25^ C will be

Options

  1. A29.5 10⁻²
  2. B10
  3. C1 10¹⁰
  4. D1 10⁻¹⁰

Correct answer

D. 1 10⁻¹⁰

Step-by-step solution

The equilibrium constant is related to the standard emf of cell by the expression K=E_ cell ^0 n 0.059 =0.295 2 0.059 K = 590 59 =10 or K =1 10⁻¹⁰

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