Which reagent is used to remove $SO_4^{2-}$ and $Cl^{-}$ ions from a solution?

The salt which responds to dilute and concentrated $H_2SO_4$ is

Which of the following is correctly matched?

$A$ salt gives violet vapours when treated with concentrated $H_2SO_4$,it contains

$A$ mixture when heated with conc. $H_2SO_4$ and $MnO_2$ produces brown fumes due to the presence of:

$A$ white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the aforementioned solution,a white precipitate is obtained which does not dissolve in dilute nitric acid. The anion is: