State True or False.
(D) : $K_{2} {H g I}_{4}$

True

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False

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Solution

The correct option is A True
The salt (A) is ${H g}_{2} {C l}_{2}$ . It is a part of calomel electrode.It is water insoluble.
It reacts with ammonia to form (B).
$H g_{2} C l_{2} + 2 N H_{4} O H \to H_{2} N - H g - C l + H g ↓ b l a c k + N H_{4} C l + 2 H_{2} O$
(B) dissolves in aqua regia to form (C) which is $H g C l_{2}$
(C) gives orange precipitate with KI which dissolves in excess of KI to form (D)
$H g C l_{2} + 2 K I \to H g I_{2} ↓ o r a n g e p r e c i p i t a t e + 2 K C l$
$H g I_{2} + 2 K I (e x c e s s) \to K_{2} [H g I_{4}]$

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