question_answer

Consider the following reaction sequence. The compound  and are, respectively,

A) \[{{H}_{2}}N.HgCl,\,HgC{{l}_{2}}\]                              

B) \[{{H}_{2}}N.HgC{{l}_{2}},{{H}_{2}}Hg{{I}_{4}}\]

C) \[{{H}_{2}}N.HgCl+Hg,\,{{K}_{2}}[Hg{{I}_{4}}]\]

D) \[[Hg{{(N{{H}_{3}})}_{2}}]Cl,\,\,Hg{{I}_{4}}\]

Correct Answer: C

Solution :

[c] Salt [a] (\[H{{g}_{2}}C{{l}_{2}},\]calome1'ionic compound)is blackened by \[N{{H}_{3}}\]. (i) \[HgC{{l}_{2}}(A)+2N{{H}_{3}}\xrightarrow{{}}\underset{\begin{smallmatrix}  (B) \\  (Black) \end{smallmatrix}}{\mathop{[{{H}_{2}}N.HgCl+Hg]}}\,+N{{H}_{4}}Cl\](ii)