Which of the following substances,when dissolved in water,will give a solution that does not conduct electricity?

$A$ solution of a weak acid is diluted by adding an equal volume of water. Which of the following will not change?

$A$ solution of $HCl$ in water is a good conductor while gaseous hydrogen chloride is not. This is due to the reason that

The equivalent conductance of benzoic acid is $12.8 \ ohm^{-1} \ cm^{2} \ eq^{-1}$. If the equivalent conductance of benzoate ion and $H^{+}$ ion at infinite dilution is $42 \ ohm^{-1} \ cm^{2} \ eq^{-1}$ and $288.42 \ ohm^{-1} \ cm^{2} \ eq^{-1}$ respectively,then its degree of dissociation is ............. $\%$

Which of the following is a poor conductor of electricity?

If $\alpha$ is the degree of ionization,$C$ is the concentration of a weak electrolyte,and $K_a$ is the acid ionization constant,then the correct relationship between $\alpha$,$C$,and $K_a$ is: