Which mixture of the solutions will lead to the formation of negatively charged colloidal `[Agl]^(-)` sol. ?

Options

A. 50 mL of 1 M `AgNO_(3)` + 50 mL of 1.5 M KI
B. 50 mL of 1 M `AgNO_(3)` + 50 mL of 2 M KI
C. 50 mL of 2 M `AgNO_(3)` + 50 mL of 1.5 M KI
D. 50 mL of 0.1 M `AgNO_(3)` + 50 mL of 0.1 M KI

Answer

B

Explanation

Due to adsorption of common ion from dispersions normally there is charge present on the colloid.
No of Millimole of KI is maximum in `(50xx2=100)` so it will act as solvent and adsorbed by the colloid AgI formed
`underset(D.P.)(AgNO_(3))+underset(("express"))underset(D.M.)(KI)tounderset("colloid")underset("charged")underset("Negatively")(AgI)+KNO_(3)`