In the electrochemical cell, cd + Sn+4 -> cd+2 + Sn+2Increase in the concentration of Sn+2:
Correct answer: B. Decreasing the emf of cell
- A. Increases the emf of the cell.
- B. Decreasing the emf of cell
- C. No change in emf of the cell.
- D. Unpredictable.
Explanation
Increasing the concentration of Sn2+ in an electrochemical cell decreases the EMF (cell potential). According to the Nernst equation, the cell potential depends on the reaction quotient, which increases as the concentration of products increases. This, in turn, lowers the driving force for the cell reaction, resulting in a decreased EMF. Thus, Option B is correct. Option A is incorrect because it states the opposite effect, Option C is incorrect because changes in concentration do affect the EMF, and Option D is incorrect because the effect is predictable using the Nernst equation.
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