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At equilibrium the EMF of a cell is

  • A.zero
  • B.equal to its standard EMF
  • C.at its maximum value
  • D.negative and equal to the reverse reaction's EMF

Answer: A

The reaction has no further tendency to proceed in either direction, so no work can be extracted and the free energy change is zero. Setting the Nernst equation to zero yields the equilibrium constant from the standard EMF.

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