Mark the correct relationship from the following:

Options

A. Equilibrium constant is related to emf as log `K="nFE"/"2.303RT"`
B. EMF of a cell `Zn|Zn_((a_1))^(2+)"| |"Cu_((a_2))^(2+)|Cu` is `E=E^@-"0.591"/n"log " ([a_2])/([a_1])`
C. Nernst equations is `E_"cell"=E_"cell"^@-0.0591/n"log""[Products]"/"[Reactants]"`
D. For the electrode `M^(n+)//M` at 273 K `E=E^@+ 0.591/n "log"[M^(n+)]`

Answer

C

Explanation

(a)log K =`(nFE_"cell"^@)/"2.303RT"`
(b)`E_"cell"=E_"cell"^@-0.0591/2 "log"([a_1])/([a_2])`
(d)Expression is valid at 298 K , not at 273 K.