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Question: Answered & Verified by Expert
In which of the following, $\mathrm{NH}_3$ is not used?
Chemistryp Block Elements (Group 15, 16, 17 & 18)JIPMERJIPMER 2011
Options:
  • A Tollen's reagent
  • B Nessler's reagent
  • C Group reagent for the analysis of IV group basic radicals
  • D Group reagent for the analysis of III group basic radicals
Solution:
2180 Upvotes Verified Answer
The correct answer is: Nessler's reagent
Potassium tetraiodo mercurate (II), i.e., $\mathrm{K}_2\left[\mathrm{HgI}_4\right]$ dissolves in KOH solution to give Nessler's reagent. Nessler's reagent is used to test $\mathrm{NH}_4^{+}$ions.

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