Q.

Identify the correct decreasing order of coagulating value of the following electrolytes when each of them is separately added to As2S3 sol(Assume all electrolytes are strong electrolytes).

Moderate

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AlF3>Na2SO4>Ba3(PO4)2

Ba3(PO4)2>Na2SO4>AlF3

AlF3>Ba3(PO4)2>Na2SO4

Na2SO4>Ba3(PO4)2>AlF3

answer is 4.

(Detailed Solution Below)

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Detailed Solution

As2S3 is a negative sol. According to Hardy Schulze rule “A negative sol is most effectively coagulated by a cation with higher valency”.∴ coagulating power of Al+3>Ba+2>Na+ in the coagulation of As2S3 solution.Number of milli moles of electrolyte added to one litre of colloid to protect it from coagulation in two hours is called flocculating value or coagulating value.Coagulation power ∝1Coagulation value;Thus coagulating value of Al+3

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