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Question

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


  1. 100 mL of 0.2 M AgNO3 + 100 mL of 0.1 M KI

  2. 100 mL of 0.18 M AgNO3 + 100 mL of 0.15 M KI

  3. 100 mL of 0.1 M AgNO3 + 100 mL of 0.1M KI

  4. 100 mL of 0.1 M AgNO3 + 100 mL of 0.2 M KI


Solution

The correct option is D

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

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