JAMB Chemistry 2013 Objective — Question 24

Question 24 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2013 Objective paper, with the correct answer and a full explanation.

In an electrochemical cell, polarization is caused by A. tetraoxosulphate (VI) acid B. hydrogen sulphide C. chlorine D. oxygen

A. tetraoxosulphate (VI) acid
B. hydrogen sulphide
C. chlorine
D. oxygenCorrect

Explanation

Polarization is caused by the formation of hydrogen (from reduction) coating the electrode; it is reduced by the use of depolarizers such as manganese(IV) oxide (MnO2). The gas responsible for polarization here is oxygen/hydrogen gas evolved at the electrode — per the printed key the answer is D.

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