Question

Which of the following type of polarization has a negligible effect on velocity?

(a) Concentration polarization

(b) Activation polarization

(c) Concentration polarization and Activation polarization

(d) Neither concentration nor Activation polarization

The question was asked at a job interview.

This intriguing question comes from Modern Theory Applications in division Modern Theory Applications of Corrosion Engineering

Answer 1

Right choice is (b) Activation polarization

Explanation: Activation polarization is the mechanism of polarization in which the activation energy of reactants at the interface is the driving force. It has a negligible effect on velocity as it is independent of diffusion of ions in the bulk solution.