A sol contains positively charged colloidal p | vedclass

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(B) According to the Hardy-Schulze rule,the coagulating power of an electrolyte increases with the increase in the magnitude of the charge on the ion

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$K_4[Fe(CN)_6]$

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(B) According to the Hardy-Schulze rule,the coagulating power of an electrolyte increases with the increase in the magnitude of the charge on the ion opposite to that of the colloidal particles.Since the sol is positively charged,the coagulating power depends on the negative ion (anion).The valency of the anions in the given electrolytes are:$Cl^-$ (from $NaCl$): $-1$$[Fe(CN)_6]^{4-}$ (from $K_4[Fe(CN)_6]$): $-4$$Cl^-$ (from $ZnCl_2$): $-1$$SO_4^{2-}$ (from $Na_2SO_4$): $-2$The anion with the highest valency is $[Fe(CN)_6]^{4-}$,which has a charge of $-4$.Therefore,$K_4[Fe(CN)_6]$ will have the highest coagulating power and will require the minimum concentration for coagulation.

$A$ sol contains positively charged colloidal particles. Which of the following solutions will require the minimum concentration for its coagulation?

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