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Byju's Answer

Standard XII

Chemistry

Central Atom and Ligands

A is a colour...

Question

A is a colourless substances. Aqueous solution of A gives reddish-orange ppt with KI; ppt dissolves in excess of KI forming a colourless solution. If ${N H}_{4} C l$ and $N a O H$ solution is added to this colourless solution reddish brown ppt is formed. Substance A is :

Epsom salt

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Mohr's salt

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Calomel

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Corrosive sublimate

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Solution

The correct option is D Corrosive sublimate
The compound (A) is Corrosive sublimate or Mercury(II) chloride $H g C l_{2}$ .

It is colourless substance. It reacts with KI to form reddish orange ppt
$H g C l_{2} + 2 K I \to [H g I_{2} ↓ (r e d d i s h o r a n g e) + 2 C l^{-}$

This ppt dissolves in excess of KI.

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

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A is a colourless substances. Aqueous solution of A gives reddish-orange ppt with KI; ppt dissolves in excess of KI forming a colourless solution. If NH4Cl and NaOH solution is added to this colourless solution reddish brown ppt is formed. Substance A is :

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A is a colourless substances. Aqueous solution of A gives reddish-orange ppt with KI; ppt dissolves in excess of KI forming a colourless solution. If ${N H}_{4} C l$ and $N a O H$ solution is added to this colourless solution reddish brown ppt is formed. Substance A is :