The coagulating power of electrolytes having ions Na+, Al3+ and Ba2+ for arsenic sulfide sol increases in the order

A
${Al}^{3 +} < {Ba}^{2 +} < {Na}^{+}$
B
${Na}^{+} < {Ba}^{2 +} < {Al}^{3 +}$
C
${Ba}^{2 +} < {Na}^{+} < {Al}^{3 +}$
D
${Al}^{3 +} < {Na}^{+} < {Ba}^{2 +}$

Solution:

According to Hardy Schulze rule, greater the charge on cation, greater is its coagulating power for negatively charged solution. So, order of coagulating power ${Na}^{+} < {Ba}^{2 +} < {Al}^{3 +}$

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