Question 39
Current ElectricityWhich of the following can be used to reduce local action in a Leclanche cell?
- A.A carbon rod as the positive pole
- B.Pure zinc as the negative pole
- C.Potassium permanganate solution in contact with the positive pole
- D.Common salt solution
Show the answer and explanation
Answer: B (Pure zinc as the negative pole)
Explanation
Local action is caused by impurities in the zinc forming tiny cells. Using pure (or amalgamated) zinc prevents it.