AIIMS 2018 Chemistry Colloids MCQ Question

Option B is correct because the statement regarding the mixing of silver nitrate (AgNO₃) with excess potassium iodide (KI) leading to the formation of negatively charged colloids is accurate; the reaction produces silver iodide (AgI), which can form a negatively charged colloidal solution. Other options may be incorrect as they either misinterpret the charge of the colloid formed or fail to recognize the nature of the reaction, which is a double displacement reaction resulting in the precipitation of AgI, while excess KI stabilizes the colloid through charge interactions. Understanding the charge dynamics in colloidal systems is crucial for grasping the behavior of colloids in solution.