The (∂E/∂T)p of different types of half cells are as follows : ABCD( 1 x 10^-4)(2 x 10^-4) (0.1 x 10^-4) (0.2 x 10^-4)

Question

The (∂E/∂T)p of different types of half cells are as follows : 

(Where E is the electromotive force) 

Which of the above half cells would be preferred to be used as reference electrode ? 

(A) A 

(B) B 

(C) C 

(D) D

Answer 1

Correct option is (C) C

A cell with less variation in EMF with temperature is preferred as reference electrode because it can be used for wider range of temperature without much derivation from standard value so a cell with less (∂E/∂T)p is preferred.