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Q.

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As2S3 are given : I. (NaCl) = 52 II. (BaCl2) = 0.69 III. (MgSO4) = 0.22 Correct order of their coagulating power is

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a

I > II > III   

b

II > I > III

c

III > I > II

d

III > II > I

answer is C.

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Detailed Solution

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Coagulating power\;\propto\;\frac{1}{coagulatingvalue}

Coagulating value of  MgSO4(III) <BaCl2 (II) <NaCl(I)

To cause coagulation of As2S3 sol

  \therefore Order of coagulation power is   III > II > I

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