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The concentration of electrolyte required to coagulate a given amount of $As_2S_3$ sol. is minimum in the case of:

(a) Potassium sulphate

(b) Aluminium nitrate

(c) Magnesium nitrate

(d) Potassium nitrate

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Answer: Aluminium nitrate
$As_2S_3$ is a negatively charged sol. As such $Al^{3+}$ from $Al(NO_3)_3$ will be most effective for bringing about the coagulation.


answered Dec 14, 2013 by mosymeow_1

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