Hardy-Schulze rule explains the effect of electrolytes on the coagulation of colloidal solution. According to this rule, coagulation power of cations follow the order

A
${Ba}^{+ 2} > {Na}^{+} > A l^{+ 3}$
B
$A l^{+ 3} > {Na}^{+} > {Ba}^{+ 2}$
C
${Ba}^{+ 2} > A l^{+ 3} > {Na}^{+}$
D
$A l^{+ 3} > {Ba}^{+ 2} > {Na}^{+}$

Solution:

According to this law, the coagulating effect of an ion on dispersed phase of opposite charge increases with the increase in valency of the ion. The precipitating power of

${Al}^{+ 3}, {Ba}^{+ 2}, {Na}^{+}$ ions is in order ${Al}^{+ 3} > {Ba}^{2 +} > {Na}^{+}$

Solution:

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