Question

A negatively charged suspension of clay in water will need for precipitation the minimum amount of.
A) Aluminium Chloride.
B) Potassium sulfate.
C) Sodium hydroxide.
D) Hydrochloric acid.

Answer 1

We understand that the Coagulating power depends on the sort of colloid. If the mixture is negative, the particle with highest electric charge can have the very best coagulating power and if the colloid is positive then the ion with highest electric charge will have the highest coagulating power.

Complete step by step answer:
Let us discuss regarding coagulation as,
Coagulation is discovered in surface chemistry. It's the method in which particles mix with one another and form larger particles and these particles calm down as precipitates. Natural process is additionally referred to as precipitation and activity and this process is allotted by the solutions that are other to the solution. Hardy-Schulze rule. If the valency of oppositely charged ions of the electrolyte being added is bigger, quicker is that the coagulation. If the valency of coagulating ions is greater than greater is the coagulation power. According to the on top of expressed rule.
As the coagulating power of $A{l^{3 + }}$ is highest because of high charge and little size, therefore, chloride is needed in minimum quantity to coagulate charged suspension of clay in water.
Therefore, the option A is correct.
The potassium, sodium, and hydrogen are of small charge and therefore, the options B,C and D are incorrect.

So, the correct answer is Option A.

Note: We must remember that there are 2 varieties of colloids, they're positive and negative colloids. Positive colloids or SOLs: Positive sols have electric charge and every one the metal hydroxide are positive sols. Negative colloids or SOLs. Negative sols have electric charge and all the metal sulfides are negative sols.