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

A l C l_{3} > K_{3} [F e (C N)_{6}] > K_{2} C r O_{4} > K B r = K N O_{3}

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K_{3} [F e (C N)_{6}] < K_{2} C r O_{4} < K B r = K N O_{3} = A l C l_{3}

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K_{3} [F e (C N)_{6}] > A l C l_{3} > K_{2} C r O_{4} > K B r > K N O_{3}

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K_{3} [F e (C N)_{6}] < K_{2} C r O_{4} < A l C l_{3} < K B r < K N O_{3}

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Solution

The correct option is B $K_{3} [F e (C N)_{6}] < K_{2} C r O_{4} < K B r = K N O_{3} = A l C l_{3}$
Hardy-Schulze Rule:
Greater the valence of flocculating ion added, greater is its power to cause coagulation.
$F e (O H)_{3}$ is a positive sol. Its coagulation will be caused by the anion of the electrolyte.
The flocculation value is inversely proportional to coagulation power or valency of the anion.
Flocculation value :
Flocculation value is the minimum concentration of electrolyte in millimoles required to cause coagulation of one litre of colloidal solution.
$Flocculation value = \frac{Millimoles of electrolyte}{Size of particle volume of sol in litre}$
The correct order of flocculation value is
$K_{3} [F e (C N)_{6}] < K_{2} C r O_{4} < K B r = K N O_{3} = A l C 1_{3}$

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[MNR 1991; UPSEAT 1999]

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