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Which of the following statements is correct regarding the coagulation of a lyophobic sol?
- A.The coagulation power of an electrolyte increases with the decrease in the valency of the coagulating ion.
- B.According to the Hardy-Schulze rule, greater the valency of the coagulating ion, greater is its coagulating power.
- C.Lyophobic sols are inherently stable and do not require electrolytes for coagulation.
- D.Addition of a lyophilic sol to a lyophobic sol increases the tendency of the latter to coagulate.
Show correct answer & step-by-step solution
Correct answer: B — According to the Hardy-Schulze rule, greater the valency of the coagulating ion, greater is its coagulating power.
Solution
- Lyophobic sols are stabilized by the charge on the colloidal particles.
- The Hardy-Schulze rule states that ions with opposite charge to the sol cause coagulation.
- The coagulating power increases exponentially with the valency of the active ion.
- Hence the answer is (B).
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