To a solution of colourless sodium salt, a solution of lead nitrate was added to have a white precipitate…

To a solution of colourless sodium salt, a solution of lead nitrate was added to have a white precipitate which dissolves in warm water and reprecipitates on cooling. Which of the following acid radical is present in the salt?
  1. $\mathrm{Cl}^{-}$
  2. $\mathrm{SO}_4{ }^{2-}$
  3. $\mathrm{S}^{2-}$
  4. $\mathrm{NO}_3^{-}$

Solution

$2 \mathrm{NaCl}+\mathrm{Pb}\left(\mathrm{NO}_3ight)_2 ightarrow \mathrm{PbCl}_2(\mathrm{ppt})+2 \mathrm{NaNO}_3$

Asked in: JEE-TOPICTESTS-CHEMISTRY

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