Which of the following has the highest coagul | vedclass

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(A) According to the Hardy-Schulze rule,the coagulating power of an electrolyte depends on the valency of the active ion (the ion carrying a charge op

Vedclass · Accepted Answer

$PO_4^{3-}$

Vedclass · Answer

(A) According to the Hardy-Schulze rule,the coagulating power of an electrolyte depends on the valency of the active ion (the ion carrying a charge opposite to that of the colloidal particles). $Fe(OH)_3$ is a positively charged sol. Therefore,it requires negatively charged ions for coagulation. The coagulating power increases with the increase in the magnitude of the charge on the ion. Comparing the anions: $PO_4^{3-}$ has a charge of $-3$,while $SO_4^{2-}$ has a charge of $-2$. Since the magnitude of the charge on $PO_4^{3-}$ is greater than that on $SO_4^{2-}$,$PO_4^{3-}$ has the highest coagulating power among the given options.

List-$I$	List-$II$
$A$. Negatively charged sol	$I$. Emulsion
$B$. Milk	$II$. Kala-azar
$C$. Gold number	$III$. $FeCl_3$ solution is added to excess $NaOH$ solution
$D$. Colloidal antimony	$IV$. Protection of colloids

Which of the following has the highest coagulating power for a $Fe(OH)_3$ sol?

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Identify the negatively charged sol from the following.

Match the items in List-$I$ with the items in List-$II$.
List-$I$ List-$II$
$A$. Negatively charged sol $I$. Emulsion
$B$. Milk $II$. Kala-azar
$C$. Gold number $III$. $FeCl_3$ solution is added to excess $NaOH$ solution
$D$. Colloidal antimony $IV$. Protection of colloids

Give information about coagulation or precipitation.

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