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Question

Nessler's reagent is an aqueous solution which contains


A

Sodium chloride

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B

Mercuric chloride

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C

Potassium Hydroxide

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D

alkalic K2HgI4

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Solution

  • ​Nessler's reagent an alkaline aqueous solution of potassium tetraiodomercurate (II)
  • It contains aqueous solution of potassium iodide, mercuric chloride, and potassium hydroxide.
  • Its chemical formula is K2HgI4.
  • It is used to detect the presence of ammonia.
  • It turns into pale brown colour in presence of ammonia.

Hence, option (D) is correct.


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