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Question

What is the sign of G and the value of K for a electrochemical cell for which Ecell=0.80 V?
  1. G=,K=>1
  2. G=+,K=>1
  3. G=,K=<1
  4. G=+,K=<1

A
G=+,K=>1
B
G=+,K=<1
C
G=,K=<1
D
G=,K=>1
Solution
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The standard free energy change of a cell reaction and emf of cell is given by,
G=nFEcell------------1
Emf of cell and equilibrium constant K is given by ,
E=0.0591nlogK------------2
The value of K gives the extent of the cell reaction. If the value of K is large, the reaction proceeds to larger extent.
For spontaneous reaction, G is negative and K>1.

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