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JAMB Physics 1991 Question 36

Question 36

Current Electricity

The function of the system of granulated carbon mixed with manganese (IV) oxide in a Leclanche cell is to

  1. A.increase the e.m.f. of the cell to 2.0 V
  2. B.prevent local action in the cell
  3. C.prevent polarisation in the cell
  4. D.make the cell black and hence a good radiator
Show the answer and explanation

Answer: C (prevent polarisation in the cell)

Explanation

Manganese(IV) oxide is a depolariser: it removes the hydrogen that would collect on the carbon rod and polarise the cell.