Consider the cell $Pt _{( s )}\left| H _2( g , 1 atm )\right| H ^{+}( aq , 1 M )|| Fe ^{3+}( aq ), Fe ^{2+}( aq ) Pt ( s )$ When the potential of the cell is $0.712 \, V$ at $298 \,K$, the ratio $\left[ Fe ^{2+}\right] /\left[ Fe ^{3+}\right]$ is ______(Nearest integer) Given : $Fe ^{3+}+ e ^{-}- Fe ^{2+}, E ^\theta Fe ^{3+}, Fe ^{2+} Pt =0771$ $\frac{2303 RT }{ F }=0.06 \,V$