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JEE Main201815 Apr 2018Morning ShiftChemistrySurface ChemistryActual

Which of the following statements about colloids is false?

Options

  1. AWhen silver nitrate solution is added to potassium iodide solution, a negatively charged colloidal solution is
  2. BFreezing point of colloidal solution is lower than true solution at same concentration of a solute
  3. CColloidal particles can pass through ordinary filter paper
  4. DWhen excess of electrolyte is added to colloidal solution, colloidal particle will be precipitated

Correct answer

B. Freezing point of colloidal solution is lower than true solution at same concentration of a solute

Step-by-step solution

(a) Colloidal particles are so small that they can pass through ordinary filter paper. Also, they cannot be seen with ordinary microscope. (b) Freezing point of colloidal solution is same as that of true solution at same concentration of a solute. The depression in freezing point is a colloidal property and depends on the number of solute particles and independent of size or shape of solute particles. (c) When silver nitrate solution is added to potassium iodide solution, a negatively charged colloidal solution is

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