Surface Chemistry - Result Question 21

####22. Among the electrolytes $Na _2 SO _4, CaCl _2, Al _2\left(SO _4\right) _3$ and $NH _4 Cl$, the most effective coagulating agent for $Sb _2 S _3$ sol is

$(2009,1 M)$

(a) $Na _2 SO _4$

(b) $CaCl _2$

(c) $Al _2\left(SO _4\right) _3$

(d) $NH _4 Cl$

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Answer:

Correct Answer: 22. (b)

Solution:

  1. $Sb _2 S _3$ is a negative (anionic) sol. According to Hardy Schulze rule, greater the valency of cationic coagulating agent, higher its coagulating power. Therefore, $Al _2\left(SO _4\right) _3$ will be the most effective coagulating agent in the present case.


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