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.

List-$I$	List-$II$
$A$. Osmosis	$I$. Solvent molecules pass through semi permeable membrane towards solvent side.
$B$. Reverse osmosis	$II$. Movement of charged colloidal particles under the influence of applied electric potential towards oppositely charged electrodes.
$C$. Electro osmosis	$III$. Solvent molecules pass through semi permeable membrane towards solution side.
$D$. Electrophoresis	$IV$. Dispersion medium moves in an electric field.

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

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