Question

Mark the correct relationship from the following.

• A. Equilibrium constant is related to emf as $\log K = \frac{nFE}{2.303RT}$
• B. EMF of a cell $Zn|Z{n^{2 +}}_{(a_{1})}||C{u^{2 +}}_{(a_{2})}|Cuis$ $E = Eº - \frac{0.591}{n}\log\frac{\lbrack a_{2}\rbrack}{\lbrack a_{1}\rbrack}$
• C. Nernst equation is $E_{cell} = Eº_{Cell} - \frac{0.0591}{n}\log\frac{\lbrack\Pr oducts\rbrack}{\lbrack{Re}ac\tan ts\rbrack}$
• D. For the electrode $M^{n +}.M$ at 273 k $E = Eº + \frac{0.591}{n}\log\lbrack M^{n +}\rbrack$

Answer 1

Answer: (C)

Nernst equation is

$E_{cell} = Eº_{Cell} - \frac{0.0591}{n}\log\frac{\lbrack\Pr oducts\rbrack}{\lbrack{Re}ac\tan ts\rbrack}$

Answer 2

(1) $\log K = \frac{nFEº_{Cell}}{2.303RT}$

(2) $E_{cell} = Eº_{cell} - \frac{0.0591}{2}\log\frac{\lbrack a_{1}\rbrack}{\lbrack a_{2}\rbrack}$

(4) Expression is valid at 298 K, not at 273 K.