Single Choice

The coagulating power of electrolytes having ions $$Na^{+},\ Al^{3+}$$ and $$Ba^{2+}$$ for arsenic sulphide sol increases in the order:

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

Solution

$$As_{2}S_{3}$$ is an anionic sol (negative sol). Hence, coagulation will depend upon the coagulating power of the cation. Now, according to the Hardy-Schulze rule, the coagulating power of cation is directly proportional to the valency of the cation. Hence, the order is $$Na^{+} < Ba^{2+} < Al^{3+}$$.

SIMILAR QUESTIONS

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