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In which of the following, $\mathrm{NH}_3$ is not used?
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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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