Which of the following solutions will have the highest electrical conductivity?

Water cannot be made conducting by adding a small amount of any of the following,except:

The degree of ionization of a weak electrolyte increases with:

Which of the following aqueous solutions will conduct an electric current quite well?

The molar conductivity of $0.01 \ M$ acetic acid at $25^{\circ} C$ is $16.5 \ \Omega^{-1} \ cm^2 \ mol^{-1}$ and its molar conductivity at infinite dilution is $390.7 \ \Omega^{-1} \ cm^2 \ mol^{-1}$. What is its degree of dissociation?

Given the two concentrations of $HCN$ $(K_a = 10^{-9})$ are $0.1 \ M$ and $0.001 \ M$ respectively. What will be the ratio of their degrees of dissociation?