\((1)\) \(\lambda_{ m }^{\infty}( NaI )=12.7 \,m\,S m ^{2}\, mol ^{-1}\)
\((2)\) \(\lambda_{ m }^{\infty}\left( NaNO _{3}\right)=12.0 \,m\,S m ^{2}\, mol ^{-1}\)
\((3)\) \(\lambda_{ m }^{\infty}\left( AgNO _{3}\right)=13.3\,m\,S m ^{2}\, mol ^{-1}\)
\(\lambda_{ m }^{\infty}( Ag I )=(1)+(3)-(2)\)
\(=12.7+13.3-12.0\)
\(=26.0-12.0\)
\(\lambda_{ m }^{\infty}( Ag I )=14.0\)
$Cr\, | \,Cr^{3+}_{(0.1\,M)}\,||\, Fe^{2+}_{(0.01\, M)}\,|\, Fe$
$(i)$ $A + e \rightarrow A^{-} ; E^o= -0.24 V$
$(ii)$ $B^{-} + e \rightarrow B^{2-}; E^o = + 1.25 V$
$(iii)$ $C^{-} + 2e \rightarrow C^{3-}; E^o = -1.25 V $
$(iv)$ $D + 2e \rightarrow D^{2-}; E^o = + 0.68 V$