Thus, (B) is $({H g N H}_{2} C l + H g)$ .

State whether the given statement is true or false.

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 the 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 an orange precipitate with KI which dissolves in excess of KI to form (D)

$H g C l_{2} + 2 K I \to H g I_{2} ↓ o r a n g e p r e c i p i t a t e + 2 K C l$

$H g I_{2} + 2 K I (e x c e s s) \to K_{2} [H g I_{4}]$

Hence, the given statement is $true$

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