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Which reagent is used to remove `SO_(4)^(2-)` or `Cl^(-)` from water ?

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Which reagent is used to remove `SO_(4)^(2-)` or `Cl^(-)` from water ?
A. NaOH
B. `Pb(NO_(3))_(2)`
C. `BaSO_(4)`
D. `KOH`
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Correct Answer - B
`Pb^(2+)+SO_(4)^(2+) to PbSO darr` (ppt)
`Pb^(2+)+Cl^(-) to PbCl_(2) darr` (ppt)
Others does not from precipitate with both anions.
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