Question

The temperature coefficient of the e.m.f. of cell, ${\left(\frac{dE}{dT}\right)}_p$ is given by:

(A) $\frac{nF}{△S}$

(B) $\frac{△S}{nF}$

(C) $\frac{△S}{nFT}$

(D) $-nFE$

• A. $\frac{nF}{△S}$
• B. $\frac{△S}{nF}$
• C. $\frac{△S}{nFT}$
• D. $-nFE$

Answer 1

Answer: (B)

As we know,

$E_{cell}=-\frac{\Delta G}{nF}$

$\Delta G=\frac{\Delta S}{dT}$

The temperature coefficient $\left(\frac{dE}{dT}\right)=\frac{\Delta S/dT}{dT.nF}=\frac{\Delta S}{nF}$

Hence, option (B) is correct.