Question

Which of the following is not a generally used electrolyte in the salt bridges used to connect the two half-cells of an electrochemical cell?

(a) NaCl

(b) KNO3

(c) KCl

(d) ZnSO4

This question was posed to me by my college professor while I was bunking the class.

My query is from Electrochemical Cells topic in portion Electrochemistry of Chemistry – Class 12

Answer 1

The correct choice is (d) ZnSO4

For explanation I would say: A salt bridge is a device used to connect the oxidation and reduction half-cells of a galvanic cell (a type of electrochemical cell). Strong electrolytes are generally used to make the salt bridges in electrochemical cells. Since ZnSO4 is not a strong electrolyte, it is not used to make salt bridges.