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JEE Main202329 Jan 2023Morning ShiftChemistrySurface ChemistryActual

Which of the following salt solutions would coagulate the colloid soloution formed when FeCl 3 is added to NaOH solution, at the fastest rate?

Options

  1. A10   mL of 0 . 2   mol   dm - 3   AlCl 3
  2. B10   mL of 0 . 1   mol   dm - 3   Na 2 SO 4
  3. C10   mL of 0 . 1   mol   dm - 3   Ca 3 PO 4 2
  4. D10   mL of 0 . 15   mol   dm - 3   CaCl 2

Correct answer

A. 10   mL of 0 . 2   mol   dm - 3   AlCl 3

Step-by-step solution

Generally, the greater the valence of the flocculating ion added, the greater its power to cause precipitation. In the coagulation of a negative sol, the flocculating power is in the order: Al 3 +   >   Ba 2 +   >   Na + FeCl 3 with NaOH forms a negative sol. So, AlCl 3 coagulate it most.

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