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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) $SO_4^{2-}$

Answer: $SO_4^{2-}$

White ppt. of $BaSO_4$ is insoluble in dil. $HCl$ and other mineral acids.