The following data is obtained for coagulating a positively charged sol in 2 hours
\(\begin{array}{|c|l|}\hline \text{Conc. of } \mathrm{Cl}^{-} \text{ in } \mathrm{mol} \mathrm{L}^{-1} & \text{ Result } \\ \hline 5 \times 10^{-5} & \text{Sol not precipitated} \\ \hline 6 \times 10^{-5} & \text{Sol not precipitated} \\ \hline 7 \times 10^{-5} & \text{Sol precipitated} \\ \hline 8 \times 10^{-5} & \text{Sol precipitated} \\ \hline 1 \times 10^{-4} & \text{Sol precipitated} \\ \hline\end{array}\)
What is the coagulating value of electrolyte for this sol?

1. A \(7 \times 10^{-5}\)
2. B \(7 \times 10^{-2}\)
3. C \(5 \times 10^{-2}\)
4. D \(9 \times 10^{-2}\)