Arsenic sulfide is a negatively charged sol. Which of the following reagents has the lowest coagulating power for it?

Sulphur sol contains

The function of $Fe(OH)_{3}$ in the contact process is

The critical micelle concentration $(CMC)$ of a soap solution is $5 \times 10^{-4} \ mol \ L^{-1}$. Identify the correct statements about this solution.
$I$. The micelle is stable if the soap solution concentration is $10^{-7} \ mol \ L^{-1}$
$II$. The micelle is stable if the soap solution concentration is higher than $5 \times 10^{-4} \ mol \ L^{-1}$
$III$. Micelles are also known as associated colloids.

Alum is a water purifier because it

The migration of positively charged colloidal particles under an electrical field towards the cathode is called: