Which mixture of the solutions will lead to the formation of negatively charged colloidal [Agl]l– sol ?

• 50 mL of 1 M AgNO₃ + 50 mL of 2 M KI

• 50 mL of 2 M AgNO₃ + 50 mL of 1.5 M KI

• 50 mL of 0.1M M AgNO₃ + 50 mL of 0.1 M KI

• 50 mL of 1 M AgNO₃ + 50 mL of 1.5 M KI