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Paragraph: The most important property of hydrophobic colloidal dispersions is that the particles carry electric charge. This charge is largely responsible for the stability of lyophobic sols Paragraph: Consider the method of preparation of sols by adsorption of common ion. Which of these given sols carry positive charge?

Options

  1. AAdding silver nitrate to a solution containing potassium iodide
  2. BAddition of FeCl ₃ to excess of hot water
  3. CAdding potassium iodide to a solution containing silver nitrate
  4. DAddition of FeCl ₃ to NaOH solution

Correct answer

C. Adding potassium iodide to a solution containing silver nitrate

Step-by-step solution

(B) Fe ₂ O ₃ xH ₂ O / Fe ³⁺ (C) AgI / Ag ⁺ Common ion present in excess is adsorbed

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