Question

Why do leak proof dry cells have an iron or steel sheet covering the zinc cylinder?

(a) It increases the potential difference between the anode and cathode

(b) It acts as a barrier around the zinc cylinder which can develop holes during use

(c) It makes it waterproof

(d) It prevents the leakage of current

I got this question in semester exam.

My question is based upon Electrochemistry in division Electrochemistry of Chemistry – Class 12

Answer 1

Right choice is (b) It acts as a barrier around the zinc cylinder which can develop holes during use

The explanation: In a dry cell, zinc loses electrons and the zinc ions dissolve into the electrolyte. As a result, the zinc cylinder of the dry cell develops holes as it is used. To prevent the leakage of electrolyte through these holes, an iron or steel sheet is used to cover the cylinder.