Multiple choice

Nessler's reagent gives yellow or brown colour or precipitate when added to solutions containing ammonia or ammonium ions. Among the following which one is mainly used as nessler's reagent ?

  1. Potassium tetrachloroplatinate(II)

  2. Potassium tetraiodomercurate(II)

  3. Potassium peroxochromate

  4. Potassium tetraphenylborate
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B Correct answer
Explanation

Potassium tetraiodomercurate(II) is an inorganic compound containing potassium cations and the tetraiodomercurate(II) complex anion. It is mainly used as nessler's reagent, a 0.09 mol/L solution of potassium tetraiodomercurate(II) (K2[HgI4]) in 2.5 mol/L potassium hydroxide, used to detect ammonia.

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