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A salt solution is acidified with dil. HCl and `BaCl_2` solution is added. A white ppt. is formed. The salt contains
A. `Cl^(-)`
B. `Br^(-)`
C. `NO_(3)^(-)`
D. `SO_(4)^(2-)`

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`SO_(4)^(2-) +BaCl_(2) overset(HCl)to underset("White ppt.")(BaSO_(4) darr)+2Cl^(-)`
White ppt. of `BaSO_(4)` is insoluble in dil. HCl and other mineral acids.

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