A negatively charged sol will require minimum amount of which electrolyte for its…

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Problem

A negatively charged sol will require minimum amount of which electrolyte for its coagulation: (1) NaNO3\text{NaNO}_3 (2) Mg(NO3)2\text{Mg}(\text{NO}_3)_2 (3) Al(NO3)3\text{Al}(\text{NO}_3)_3 (4) Th(NO3)4\text{Th}(\text{NO}_3)_4

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