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JEE Main20199 Jan 2019Evening ShiftChemistrySurface ChemistryActual

For coagulation of arsenious sulphide sol, which of the following salt solutions will be most effective?

Options

  1. AN a 3 P O 4
  2. BN a C l
  3. CA l C l 3
  4. DB a C l 2

Correct answer

C. A l C l 3

Step-by-step solution

According to Hardy's -schulz rule, greater the valency of the active ion or flocculating ion greater will be its coagulating power. S - 2 is - v e charged colloid so cation having more + v e charge, more will be coagulating power. Hence A l + 3 having maximum coagulating power

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