Question

On adding AgNO₃ solution into KI solution, a negatively charged colloidal sol is obtained when they are in :

• A. 100 mL of 0.1 M AgNO₃ + 100 mL of 0.1M KI
• B. 100 mL of 0.1 M AgNO₃ + 100 mL of 0.2 M KI
• C. 100 mL of 0.2 M AgNO₃ + 100 mL of 0.1 M KI
• D. 100 mL of 0.18 M AgNO₃ + 100 mL of 0.15 M KI

Answer 1

The correct option is B

100 mL of 0.1 M AgNO₃ + 100 mL of 0.2 M KI

Since the ppt is AgI, I^- ion must be in excesses to get negatively charged colloid