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On passing a gas, ' X ', through Nessler's reagent, a brown precipitate is obtained. The gas ' X ' is

Options

  1. AH 2 S
  2. BCO 2
  3. CNH 3
  4. DCl 2

Correct answer

C. NH 3

Step-by-step solution

Nessler's reagent is an aqueous solution of potassium iodide, mercuric chloride, and potassium hydroxide. Its chemical formula is K 2 HgI 4 . It is used to detect the presence of ammonia. It turns into a pale brown colour in the presence of ammonia. Nessler’s Reagent Reaction: 2 K 2 HgI 4 ⏟ Nessler ' s reagent + NH 3 + 3 KOH → HgO . Hg NH 2 I ⏟ Iodide of Millon ' s base brown precipitate + 7 KI + 2 H 2 O

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