Post-UTME Physics 2018 Objective — Question 1

Question 1 of 20 from the Post-UTME Screening (Post-UTME) Physics 2018 Objective paper, with the correct answer and a full explanation.

In a simple cell, a defect known as polarization is due to the

A. deposition of zinc on the anode
B. dissolution of zinc in the electrolyte
C. collection of hydrogen bubbles at the cathode/positive plateCorrect
D. impurities in the electrolyte

Explanation

Polarization in a simple cell is caused by a layer of hydrogen bubbles building up on the copper (positive) plate, which increases internal resistance and reduces the cell's e.m.f.

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