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pH the Power of H

A white sodiu...

Question

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:

A

C O_{3}^{2 -}

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B

S^{2 -}

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C

S O_{4}^{2 -}

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D

C l^{-}

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Solution

The correct option is D $C l^{-}$
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 $A g N O_{3}$ to form a white curdy ppt of $A g C l$ , which is water insoluble and also insoluble in dil $H N O_{3}$ but soluble in dilute ammonia due to formation of soluble complex.
$C l^{-} + A g^{+} \to A g C l ↓$
$A g C l + 2 N H_{3} \to [A g (N H_{3})_{2}] C l$

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