Question

What is the cause of the formation of the depletion layer?

(a) Deletion in charge carriers

(b) Leakage current

(c) Deposition of extra layer on pure metal

(d) Extra depletion

I got this question during an interview for a job.

My query is from Electroplating Equipment and Operating Conditions topic in chapter Electroplating of Engineering Chemistry II

Answer 1

Right answer is (c) Deposition of extra layer on pure metal

Explanation: When electroplating takes place, there is a value called the critical concentration where the amount of deposition is controlled by the passage of current. When this concentration exceeds, we get a depletion layer.