In the coagulation of a positive sol, flocculation powers of ${Cl}^{-}, {SO}_{4}^{2 -}$ , and ${PO}_{4}^{3 -}$ . are in the order

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${Cl}^{-} > {SO}_{4}^{2 -} > {PO}_{4}^{3 -}$

${Cl}^{-} > {PO}_{4}^{3 -} > {SO}_{4}^{2 -}$

${PO}_{4}^{3 -} > {SO}_{4}^{2 -} > {Cl}^{-}$

${PO}_{4}^{3 -} > {Cl}^{-} > {SO}_{4}^{2 -}$

answer is C.

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Detailed Solution

In the coagulation of a positive sol, flocculation powers are in the order: ${PO}_{4}^{3 -} > {SO}_{4}^{2 -} > {Cl}^{-}$ .
Coagulation power is directly proportional to the flocculation power.
Coagulating power is directly proportional to the charge of the ion. Thus, flocculation power will also be directly proportional to the charge of the ion. Moreover, for negatively charged colloids, we see the cation of the salt solution and for the positively charged colloid, we see the anion of the salt solution.