A) \[CO_{3}^{2-}\]
B) \[{{S}^{2-}}\]
C) \[SO_{4}^{2-}\]
D) \[C{{l}^{-}}\]
Correct Answer: D
Solution :
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 dil. nitric acid. The anion is \[C{{l}^{-}}\]. \[C{{l}^{-}}\]ions react with \[AgN{{O}_{3}}\] to form a white curdy ppt of \[AgCl\], which is water insoluble and also insoluble in dil \[HN{{O}_{3}}\] but soluble in dilute ammonia due to formation of soluble complex. \[\begin{align} & C{{l}^{-}}+A{{g}^{+}}\to AgCl\downarrow \\ & AgCl+2N{{H}_{3}}\to [Ag{{(N{{H}_{3}})}_{2}}]Cl \\ \end{align}\]
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