The concentration of electrolyte required to coagulate a given amount of As2S3 solution is minimum in case of

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Potassium sulphate

Aluminium nitrate

Magnesium nitrate

Potassium nitate

answer is B.

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Detailed Solution

according to Hardy-schulze rule, Greater the valency of flocculating ion(of the electrolyte) greater is its power to coagulate the oppositely charged colloidal sol.As2S3 negative sol so it is coagulated by positive ion from options,Order of coagulation value is Al+3< Mg+2< K+=Na+Order of coagulation power is Al+3> Mg+2> K+=Na+The minimum millimoles of the electrolyte required to coagulate one litre of colloidin two hours is called floculating (or) coagulation value

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