Nessler's reagent contains:

{H g}_{2}^{2 +}

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{H g}^{2 +}

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{H g I}_{4}^{2 -}

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{H g I}_{2}^{-}

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Solution

The correct option is D ${H g I}_{4}^{2 -}$
Nessler's reagent contains ${H g I}_{4}^{2 -}$ .

It is alkaline solution of $K_{2} [H g I_{4}]$ which gives brown precipitate (iodide of Millon's base) with ammonia. The reagent is used for detecting the presence of $N H_{4}^{+}$ ions.

$H g C l_{2} + 2 K I \to H g I_{2} ↓ (Orange) + 2 K C l$

$H g I_{2} + K I (excess) \to K_{2} [H g I_{4}] (Nessler's reagent)$

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