Practicing Success

Target Exam

CUET

Subject

Chemistry

Chapter

Physical: Electro Chemistry

Question:

For a cell reaction involving two electron change, the standard EMF of the cell is 0.295 V at 25C. What is the equilibrium constant of the reaction at 25C?

Options:

29.5 x 10-2

1 x 1010

10

2.95 x 10-10

Correct Answer:

1 x 1010

Explanation:

The correct answer is option 2. \(1 \times 10^{10}\)

\(E^o_{cell} =\) \(\frac{2.303RT}{nF}\)logKc = \(\frac{0.0591}{n}\) logKc

∴ 0.295 V = \(\frac{0.0591}{2}\) logKc

or logKc​= \(\frac{0.295 × 2}{0.0591}\) =10

or Kc​=1×1010