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Gold sol is an electronegative sol. The amount of electrolyte required to coagulate a certain amount of gold sol is minimum in case of

Answer»

`AlCl_(3)`
`Na_(2)SO_(4)`
`CaCl_(2)`
NaCl

Solution :This is because the oppositely charged `SO_(4)^(2-)` IONS have maximum charge. Coagulation is the conversion of a colloid into its INSOLUBLE PRECIPITATE. According to Hardy Schulze rules.
(i) A positively charged colloid is coagulated by a negative ION and vice-versa.
(ii) Increase in VALENCE of an ion decreases coagulation value of the colloid.


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