The charge required for the reduction of $1 \mathrm{~mol}$ of $ \mathrm{MnO}_4^{-}$to $\mathrm{MnO}_2$ is

At a particular temperatur , the ratio of molar conductance of specific conductance of 0.01 M NaCl solution is

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