Which of the following has minimum flocculation value for positively charged sol? (A) \( \mathrm...

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Which of the following has minimum flocculation value for positively charged sol?
(A) \( \mathrm{Cl}^{-} \)
(b) \( \mathrm{SO}_{4}^{2-} \)
(C) \( \mathrm{PO}_{4}^{3-} \)
(d) \( \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-} \)
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