Which of the following ion is most effective in coagulation of ferric hydroxide solution?

C l^{-}

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B r^{-}

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N O_{2}^{-}

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S O_{4}^{- 2}

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Solution

The correct option is D $S O_{4}^{- 2}$
The greater the valence of flocculating ion is added, the greater is its power to cause Precipitation.

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