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NEET levelSingle correct optionDifficulty 1 of 3qa056

A white precipitate is obtained when barium chloride solution is added to an aqueous salt solution, and the precipitate does not dissolve on adding dilute hydrochloric acid. The anion present is

A $PO X_{4} X^{3 -}$
B $SO X_{3} X^{2 -}$
C $CO X_{3} X^{2 -}$
D $SO X_{4} X^{2 -}$

Answer: D

Barium sulphate is insoluble in dilute HCl, whereas

BaCO X_{3}

,

BaSO X_{3}

and

Ba X_{3} (PO X_{4}) X_{2}

all dissolve in it because their anions are protonated. A precipitate that survives dilute HCl therefore indicates

SO X_{4} X^{2 -}

.

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