Which reagent is used to remove \( \mathrm{SO}_{4}^{2-} \) and \( \mathrm{Cl}^{-} \)? (a) \( \ma...

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Which reagent is used to remove \( \mathrm{SO}_{4}^{2-} \) and \( \mathrm{Cl}^{-} \)?
(a) \( \mathrm{NaOH} \)
(b) \( \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2} \)
(c) \( \mathrm{BaSO}_{4} \)
(d) \( \mathrm{KOH} \)
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