Which of the following salt solutions would coagulate the colloid solution formed when FeCl3 is added to NaOH solution, at the fastest rate? (A) 10 mL of 0.1 mol dm–3 AlCl3 (B) 10 mL of 0.2 mol dm–3 A

Question

Which of the following salt solutions would coagulate the colloid solution formed when FeCl3 is added to NaOH solution, at the fastest rate?

(A) 10 mL of 0.1 mol dm–3 AlCl3
(B) 10 mL of 0.2 mol dm–3 AlCl3
(C) 10 mL of 0.15 mol dm–3 CaCl2
(D) 10 mL of 0.1 mol dm–3 Na2SO4

Prashant Kotian · Accepted Answer

Correct answer: B. When FeCl3 is added to NaOH solution then negatively charged sol is formed. So Al+3 with more conc. has high coagulation power.

💡 Solution & Explanation