its answer is 1st option how â ‹Q2 Which of the following will form negatively charged - Chemistry - Surface Chemistry

Question

its answer is 1st option how?

â€‹Q2 Which of the following will form negatively
charged colloidal solution ?

(1) 100 ml 0 1 M AgNO3 + 100 ml 0 1 M KI (2) 100 ml 0 2
M AgNO3 + 100 ml 0 1 M Kl

(3) 100 ml 0 1 M AgNO3 + 100 ml 0 2 Kl (4) 100 ml 0 2 M
AgNO3 + 200 ml 0 1 M Kl

Raveena Sharma · Accepted Answer

The correct option is (3)

The charge on the solution will be negative When silver nitrate
solution is added to potassium iodide solution (excess), the
precipitated silver iodide adsorbs iodide ions from the dispersion
medium and negatively charged colloidal solution results

(at this stage KI is in excess, I– and being common to
AgI)

AgI + I– → (AgI)I–

Colloidal in excess Colloidal solution

particle in the medium becomes negatively charged

its answer is 1st option. how? ​Q2. Which of the following will form negatively charged colloidal solution ? (1) 100 ml 0.1 M AgNO3 + 100 ml 0.1 M KI (2) 100 ml 0.2 M AgNO3 + 100 ml 0.1 M Kl (3) 100 ml 0.1 M AgNO3 + 100 ml 0.2 Kl (4) 100 ml 0.2 M AgNO3 + 200 ml 0.1 M Kl

its answer is 1st option. how?

Q2. Which of the following will form negatively charged colloidal solution ?

(1) 100 ml 0.1 M AgNO₃ + 100 ml 0.1 M KI (2) 100 ml 0.2 M AgNO₃ + 100 ml 0.1 M Kl

(3) 100 ml 0.1 M AgNO₃ + 100 ml 0.2 Kl (4) 100 ml 0.2 M AgNO₃ + 200 ml 0.1 M Kl