A) \[P{{O}_{4}}^{3-}\]
B) \[MN{{O}_{4}}^{-}\]
C) \[N{{H}_{4}}^{+}\]
D) \[Cr{{O}_{4}}^{2-}\]
Correct Answer: C
Solution :
Nesslers reagent is prepared by the reaction of mercuric chloride in the excess of KI. \[HgC{{l}_{2}}+2KI\xrightarrow{{}}\underset{scarlet\text{ }ppt.}{\mathop{Hg{{l}_{2}}}}\,\,\,+2KCl\] \[Hg{{I}_{2}}+2KI\xrightarrow{{}}\underset{\begin{smallmatrix} potassium\text{ }tetraiodo \\ mercurate\left( II \right) \\ colourless\text{ }complex \end{smallmatrix}}{\mathop{{{K}_{2}}[Hg{{I}_{4}}]}}\,\] Alkaline solution of \[{{K}_{2}}\,[Hg{{I}_{4}}]\] is called Nesslers reagent. It is used to test \[N{{H}_{3}}\] or \[NH_{4}^{+}\] ions which give brown precipitate or colouration with ammonia due to the formation of the iodide of Millons base\[H{{g}_{2}}NI.{{H}_{2}}O\]. It has the structure (brown ppt.)You need to login to perform this action.
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