Tap water is not used to prepare a solution of silver nitrate in the laboratory. Why?

Tap water contains dissolved gases which reacts with silver nitrate to give a white precipitate of silver nitride

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Tap water contains dissolved chlorine which reacts with silver nitrate to give a white precipitate of silver chloride

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Tap water contains dissolved bromine which reacts with silver nitrate to give a white precipitate of silver bromide

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Tap water contains dissolved iodine which reacts with silver nitrate to give a white precipitate of silver iodide

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Solution

The correct option is
C. Tap water contains dissolved chlorine which reacts with silver nitrate to give a white precipitate of silver chloride
Tap water contains dissolved chloride ions which react with silver nitrate to give a white precipitate of silver chloride
$A g N O_{3} + C l^{-} (d i s s o l v e d i n t a p w a t e r) ⟶ A g C l (w h i t p r e c i p i t a t e) + N O_{3}^{-}$

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