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JEE Main20231 Feb 2023Evening ShiftChemistryd and f Block ElementsActual

Which element is not present in Nessler’s reagent?

Options

  1. AMercury
  2. BPotassium
  3. CIodine
  4. DOxygen

Correct answer

D. Oxygen

Step-by-step solution

Nessler’s reagent, K 2 HgI 4 is used to detect ammonia. It is a pale solution that gets darker yellow when some amount of ammonia is added. A brown precipitate may form at a higher concentration. Nessler's reagent can be crystallized from a concentrated solution of mercury iodide with potassium iodide. So, the correct option is D.

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