A) Passing \[H{{g}_{2}}C{{l}_{2}}\] in acid medium
B) Passing \[PbC{{l}_{2}}\] in alkaline medium
C) Passing \[PbC{{l}_{2}}\] in neutral medium
D) Passing \[HgC{{l}_{2}}\] in dry mixture
Correct Answer: A
Solution :
\[C{{u}^{2+}}\]will be precipitated as CuS in acidic medium where as \[N{{i}^{2+}}\]is not precipitated.
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