(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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(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.

Class 12 Chemistry Surface Chemistry Colloids, Emulsion, Gel and Their properties with application

Easy

Which ion has the lowest coagulating power?

A
$PO_4^{3-}$
B
$SO_4^{2-}$
C
$SO_3^{2-}$
D
$NO_3^-$

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Class 12

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Surface Chemistry

Subtopic

Colloids, Emulsion, Gel and Their properties with application

Which of the following is a positively charged sol?

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The size of a colloidal particle is

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Oils and fats are obtained by saponification of potassium stearate. Its formula is $CH_3(CH_2)_{16}COO^-K^+$. The hydrophobic end of the molecule is $CH_3(CH_2)_{16}$ and the hydrophilic end is $COO^-K^+$. Potassium stearate is an example of:

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The reason for the stability of a lyophobic sol is

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Match List-$I$ with List-$II$.

List-$I$ List-$II$

$A$. Lyophilic colloid $I$. Liquid-liquid colloid

$B$. Emulsion $II$. Protective colloid

$C$. Positively charged colloid $III$. $FeCl_3 + NaOH$

$D$. Negatively charged colloid $IV$. $FeCl_3 + \text{hot water}$

Choose the correct answer from the options given below:

List-$I$	List-$II$
$A$. Lyophilic colloid	$I$. Liquid-liquid colloid
$B$. Emulsion	$II$. Protective colloid
$C$. Positively charged colloid	$III$. $FeCl_3 + NaOH$
$D$. Negatively charged colloid	$IV$. $FeCl_3 + \text{hot water}$