Ferric hydroxide sol is a positively charged | vedclass

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(C) According to the $Hardy-Schulze$ rule,the ions carrying a charge opposite to that of the colloidal particles are responsible for coagulation.Great

Vedclass · Accepted Answer

$PO_4^{3-} > SO_4^{2-} > NO_3^-$

Vedclass · Answer

(C) According to the $Hardy-Schulze$ rule,the ions carrying a charge opposite to that of the colloidal particles are responsible for coagulation.Greater the valency of the oppositely charged ion,the higher is its coagulating power.Since ferric hydroxide sol is positively charged,it requires negatively charged ions for coagulation.The valencies of the given ions are $PO_4^{3-} (3)$,$SO_4^{2-} (2)$,and $NO_3^- (1)$.Therefore,the order of coagulating power is $PO_4^{3-} > SO_4^{2-} > NO_3^-$.

Ferric hydroxide sol is a positively charged colloid. The coagulating power of $NO_3^-$,$SO_4^{2-}$,and $PO_4^{3-}$ ions would be in the order:

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