Analytical Chemistry Question 98
Question: Nessler’s reagent is used to detect
[CPMT 1989; AIIMS 1997; MP PET 1999]
Options:
A) $ CrO_4^{2-} $
B) $ PO_4^{3-} $
C) $ MnO_4^{-} $
D) $ NH_4^{+} $
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Answer:
Correct Answer: D
Solution:
Nessler’s reagent gives red precipitate with $ NH_4^{+} $
$ NH_4Cl+2K_2[HgI_4]+4KOH\to $
$ \underset{\text{Iodide of Millon }’\text{ s base (Brown ppt)}}{\mathop{NH_2-Hg-O-Hg-I}}+\ 7KI\ +\ KCl\ +\ 3H_2O $
BETA
