Redox Reactions And Electrochemistry Ques 184

Question: For a cell reaction involving a two-electron change, the standard emf of the cell is found to be 0.295 V at 25oC . The equilibrium constant of the reaction at 25oC will be [Roorkee 1999; AIEEE 2003; CBSE PMT 2004]

Options:

A) 1×1010

B) 29.5×102

C) 10

D) 1×1010

Show Answer

Answer:

Correct Answer: D

Solution:

ΔG=nFEo ΔG=2.303RT,log,K ;

nFEo=2.303RT,log,K

logK=nFEo2.303RT=2×96500×0.2952.303×8.314×298

logK=9.97=K=1×1010 .



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