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JEE Main202330 Jan 2023Evening ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Formulae for Nessler's reagent is:

Options

  1. AKHg 2 I 2
  2. BKHgI 3
  3. CK 2 HgI 4
  4. DHgI 2

Correct answer

C. K 2 HgI 4

Step-by-step solution

Nessler's reagent is K 2 HgI 4 . Nessler's reagent is an aqueous solution of potassium iodide, mercuric chloride, and potassium hydroxide. It turns into pale brown colour in presence of ammonia.

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