Which of the following is not a conductor of electricity?

For a cell involving two electron changes, $E_{\text {cell }}^{\circ}=03 \mathrm{~V}$ at $25^{\circ} \mathrm{C}$. The equilibrium constant of the reaction is

By passing electric current, $\mathrm{NaClO}_3$ is converted in to $\mathrm{NaClO}_4$ according to the following equation

$$ \mathrm{NaClO}_3+\mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{NaClO}_4+\mathrm{H}_2 $$

How many moles of $\mathrm{NaClO}_4$ will be formed when three Faradays of charges is passed through $\mathrm{NaClO}_3$ ?

The standard reduction potential at 298 K for the following half cell reaction

$$ \begin{aligned} & 2 \mathrm{n}^{2+}(a q)+2 e^{-} \rightarrow \mathrm{Zn}(s) ; E^0=-0.762 \mathrm{~V} \\ & \mathrm{Cr}^{3+}(a q)+3 e^{-} \rightarrow \mathrm{Cr}(s) ; E^0=0.740 \mathrm{~V} \\ & 2 \mathrm{H}^{+}(a q)+2 e^{-} \rightarrow \mathrm{Hz}(g) ; E^0=0.0 \mathrm{~V} \\ & \mathrm{~F}_2(g)+2 e^{-} \rightarrow 2 \mathrm{~F}^{-}(a q) ; E^0=2.87 \mathrm{~V} \end{aligned} $$

Which of the following is strongest reducing agent?