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(B) To remove sulphate ions $(SO_4^{2-})$ from a solution containing both sulphate and chloride ions,we need a reagent that forms an insoluble precipi

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Barium hydroxide

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(B) To remove sulphate ions $(SO_4^{2-})$ from a solution containing both sulphate and chloride ions,we need a reagent that forms an insoluble precipitate with sulphate ions but remains soluble or does not react with chloride ions. $Ba^{2+}$ ions react with $SO_4^{2-}$ ions to form $BaSO_4$,which is a white precipitate. $Ba(OH)_2$ provides $Ba^{2+}$ ions in the solution. $BaSO_4$ is insoluble in water,effectively removing the sulphate ions from the solution. $BaCl_2$ would also work,but among the given options,$Ba(OH)_2$ is the correct choice.

Which reagent below would enable you to remove sulphate ions from a solution containing both sulphate and chloride ions?

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