Formation of hydrogen bubbles at the copper plate of a primary cell is called?

A. polarization.
B. back e.m.f.
C. electrolysis.
D. local action.

Correct Answer:

Option A – polarization

Explanation

Polarization: The hydrogen bubbles which are clinging over the surface of copper electrode anode becomes a thin film of hydrogen over the copper electrode.

This hydrogen film increases the internal resistance and reduces the emf of the cell and hence the cell soon becomes inactive. This effect is known as polarization