Verified Solution • 2025–26 Session moderate

QJEEM20Ch4739: JEE Main 2020 Chemistry - Class 12 JEEM20Ch4739 Solution: As per Hardy-Schulze formulation, the flocculation values of…

As per Hardy-Schulze formulation, the flocculation values of the following for ferric hydroxide sol are in the order :

Multiple Choice Options

  • A AICl3 > K3[Fe(CN)6] > K2CrO4 > KBr = KNO3
  • B K3[Fe(CN)6] < K2CrO4 < KBr = KNO3 = AlCl3
  • C K3[Fe(CN)6] < K2CrO4 < AlCl3 < KBr < KNO3
  • D K3[Fe(CN)6] > AlCl3 > K2CrO4 > KBr > KNO3

Step-by-Step Verified Solution

Since, Fe(OH)3 is positively charged sol, hence, anionic charge will flocculate.

As per Hardy Schulze rules coagulation power of anion follows the order :

Fe(CN)63– &gt; CrO42– &gt; Cl– = Br– = NO3–

Higher the coagulation power lower will be its flocculation value therefore order will be :

Fe(CN)63– &lt; CrO42– &lt; Cl– = Br– = NO3–

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