A) \[{{\left( N{{H}_{4}} \right)}_{2}}C{{r}_{2}}{{O}_{7}}\]
B) \[Hg{{I}_{2}}\]
C) \[HgO\]
D) \[P{{b}_{3}}{{O}_{4}}\]
Correct Answer: B
Solution :
\[\underset{\text{Red solid}\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{Hg{{I}_{2}}+2K}}\,I\to {{K}_{2}}(Hg{{I}_{4}})\]soluble \[Hg{{I}_{2}}\to Hg+{{I}_{2}}\] violet foams.
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