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`BaCl_2` solution gives a white ppt. with a solution of a slat, which dissolves in dil. HCl with the evolution of a colourless, pungent smelling gas. The radical in the salt is
A. `SO_(4)^(2-)`
B. `HSO_(4)^(-)`
C. `SO_(3)^(2-)`
D. `CO_(3)^(2-)`

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`SO_(3)^(2-) +Ba^(2+) to underset("White ppt.")(BaSO_(3) darr)`
`BaSO_(3)+2HCl to BaCl_(2) +H_(2)O +underset("smelling gas")underset("Pungent")(SO_(2) uarr)`

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