A red solid is insoluble in water. However, it becomes soluble if some $K I$ is added to water. Heating the red solid in a test tube results in the liberation of some violet colored fumes and droplets of metal appear on cooler part of the test tube.

The red solid is :

P b_{3} O_{4}

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H g I_{2}

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H g O

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{(N H_{4})}_{2} C r_{2} O_{7}

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Solution

The correct option is A $H g I_{2}$
$H g^{2 +} + 2 I^{-} \to H g I_{2} ↓$
Scarlet red ppt

The precipitate dissolves in excess regent when colorless tetraiodomecurate (II) ions are formed.

$H g I_{2} + 2 I^{-} \to [H g I_{4}]^{2 -}$

$H g I_{2} + 2 K I \to K_{2} [H g I_{4}]$

An akaline solution of potassium tetraidomercurate (II) serves as a selective and sensitive regent for ammonium ions (Nessle's reagent)

So, the correct option is $B$

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A red solid is insoluble in water. However, it becomes soluble if some KI is added to water. Heating the red solid in a test tube results in the liberation of some violet colored fumes and droplets of metal appear on cooler part of the test tube. The red solid is :

A red solid is insoluble in water. However, it becomes soluble if some $K I$ is added to water. Heating the red solid in a test tube results in the liberation of some violet colored fumes and droplets of metal appear on cooler part of the test tube.

The red solid is :