Which of the following is incorrectly matched?

Under the influence of an electric field,the particles in a sol migrate towards the cathode. The coagulation of the same sol is studied using $NaCl$,$Na_2SO_4$,and $Na_3PO_4$ solutions. Their coagulating values will be in the order:

Which characteristic is true in respect of colloidal particles?

Which of the following salt solutions would coagulate the colloid solution formed when $FeCl_{3}$ is added to $NaOH$ solution,at the fastest rate?

Which principle is applicable in the purification of water using alum?

Molar conductivity $\left(\Lambda_m\right)$ of an aqueous solution of sodium stearate,which behaves as a strong electrolyte,is recorded at varying concentrations $(c)$ of sodium stearate. Which one of the following plots provides the correct representation of micelle formation in the solution? (Critical micelle concentration $(CMC)$ is marked with an arrow in the figures.)