Reagent that can detect presence of ${N H}_{3}$ is called:

Fehling's solution

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Nessler's reagent

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Benedict's solution

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Lucas reagent

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B Nessler's reagent
Reagent that can detect presence of ${N H}_{3}$ is called Nessler's reagent.
Nessler's reagent can
be prepared by using $K I, H g I_{2}, a n d N a O H$
or $K I (e x c e s s), H g C l_{2} a n d N a O H$

Mercuric chloride reacts with potassium iodide to form orange ppt of mercuric iodide.
$H g C l_{2} + 2 K I ⟶ H g I_{2} o r a n g e ↓$

Mercuric iodide reacts with KI to form Nessler's reagent which is soluble in water.
$H g I_{2} + 2 K I ⟶ K_{2} H g I_{4} s o l u b l e$

Nessler's reagent is used to idntify $N H_{4}^{+}$ ions.
$K_{2} H g I_{4} + N a O H + N H_{4} C l \to H g_{2} N H_{2} O I b r o w n p r e c i p i t a t e + N a I + K C l + H_{2} O$

Option B is correct.

Suggest Corrections