Question

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

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

## The correct option is C K3[Fe(CN)6]<K2CrO4<KBr=KNO3=AlCl3The minimum concentration of an electrolyte which is required to cause the coagulation or flocculation of a sol is known as flocculation value. Flocculation value is inversely proportional to coagulation power (coagulation power is directly proportional to the valency of the ions causing coagulation). Fe(OH)3 sol is a positive sol and thus we have to consider the valency of the anions in the given electrolytes.

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