Question

The reagent used for testing ammonia is:

• A. Bayer’s reagent
• B. Nessler’s reagent
• C. Fentlon’s reagent
• D. Molisch reagent

Answer 1

The correct option is B

Nessler’s reagent

Nessler's reagent is Potassium tetraiodomercurate(II)[$K_{2}Hg{I}_4$ (or) $K_2\left[Hg{I}_4\right]$]. It is a pale alkaline solution which in the presence of ammonia turns into dark yellow coloured solution.