A) \[CrO_{4}^{2-}\]
B) \[PO_{4}^{3-}\]
C) \[MnO_{4}^{-}\]
D) \[NH_{4}^{+}\]
Correct Answer: D
Solution :
Nesslers reagent \[{{K}_{2}}[Hg{{I}_{4}}]\]in alkaline medium is used to detect \[{{K}_{2}}[Hg{{I}_{4}}]\] \[\underbrace{2{{K}_{2}}(Hg{{I}_{4}})+4KOH}_{Nesslers\,reagent}N{{H}_{4}}Cl\xrightarrow{{}}\] \[\underset{\begin{smallmatrix} \text{iodid}\,\text{of}\,\text{Millon }\!\!\!\!\text{ s}\,\text{base} \\ \text{(brown}\,\text{ppt}\text{.)} \end{smallmatrix}}{\mathop{N{{H}_{2}}HgOHgI}}\,+7KI+KCl+3{{H}_{2}}O\]
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