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What is hardy Schulz rule? Which of the following electrolyte will coagulate most easily to positively charged colloid and why?

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What is hardy Schulz rule? Which of the following electrolyte will coagulate most easily to positively charged colloid and why? 

(a) NaCl 

(b) Na2 SO4 

(c) Na3PO4 

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Coagulating power of a coagulating ion is directly proportional to the charge on the ion.

Na3PO4 will coagulate a positively charged colloid most easily because it has most negative valence.

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