A $0.004\;M$ solution of $K_2SO_4$ is isotonic with a $0.010\;M$ Solution of glucose at the same temperature . Tge apparent per cent degree of dissociation of $K_2SO_4$ is

Question

$\begin{array}{1 1} 25\% \\50\% \\ 75\% \\ 100 \% \end{array}$