# The standard e.m.f of a cell, involving one electron change is found to be 0.591 V at $25^{\circ}C$. The equilibrium constant of the reaction is $(F = 96,500\;C\;mol^{-1} : R = 8.314 \; JK^{-1}\;mol^{-1})$
( A ) $1.0 \times 10^{10}$
( B ) $1.0 \times 10^{5}$
( C ) $1.0 \times 10^{1}$
( D ) $1.0 \times 10^{30}$