Which of the following electrolytes is least | vedclass

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(C) Ferric hydroxide sol is a positively charged sol. According to the Hardy-Schulze rule,the coagulating power of an electrolyte depends on the valen

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$KBr$

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(C) Ferric hydroxide sol is a positively charged sol. According to the Hardy-Schulze rule,the coagulating power of an electrolyte depends on the valency of the oppositely charged ion (anion in this case).Greater the valency of the flocculating ion,greater is its coagulating power.The anions provided are: $[Fe(CN)_6]^{4-}$,$CrO_4^{2-}$,$Br^-$,and $SO_4^{2-}$.The valencies are: $4$,$2$,$1$,and $2$ respectively.Since $Br^-$ has the lowest valency $(1)$,it is the least effective in causing flocculation.

Which of the following electrolytes is least effective in causing flocculation of ferric hydroxide sol?

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