Which ion has the lowest coagulating power?

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(D) According to the Hardy-Schulze rule,the coagulating power of an ion is directly proportional to its valency (charge). Greater the charge on the io

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$NO_3^-$

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(D) According to the Hardy-Schulze rule,the coagulating power of an ion is directly proportional to its valency (charge). Greater the charge on the ion,higher is its coagulating power. Comparing the charges: $PO_4^{3-}$ has a charge of $-3$. $SO_4^{2-}$ and $SO_3^{2-}$ have a charge of $-2$. $NO_3^-$ has a charge of $-1$. Since $NO_3^-$ has the lowest charge (valency),it has the lowest coagulating power.

$A$. Aerosol	$I$. Milk
$B$. Foam	$II$. Soap lather
$C$. Emulsion	$III$. Cheese
$D$. Gel	$IV$. Smoke

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