A) \[Hg_{2}^{2+}\]salt
B) \[C{{u}^{2+}}\]salt
C) \[A{{g}^{2+}}\]salt
D) \[P{{b}^{2+}}\]salt
Correct Answer: D
Solution :
[d] \[PbC{{l}_{2}}\]is soluble in hot water, and insoluble in cold water. \[P{{b}^{2+}}+2HCl\to \underset{\begin{smallmatrix} white\,ppt.so\,\operatorname{lub}\,le \\ on\,heating \end{smallmatrix}}{\mathop{PbC{{l}_{2}}}}\,\downarrow \xrightarrow{{{H}_{2}}S}\underset{Black\,ppt.}{\mathop{PbS}}\,\]
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