To a solution of a colourless sodium salt, a solution of lead nitrate was added to form a white precipitate which dissolves in warm water and reprecipitates on cooling. Which of the following acid radicals is present in the salt?
- A$Cl^{-}$
- B$SO_4^{2-}$
- C$S^{2-}$
- D$NO_3^{-}$
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