A) passing \[{{H}_{2}}S\] in acid medium
B) passing \[{{H}_{2}}S\] in alkaline medium
C) passing \[{{H}_{2}}S\] in neutral medium
D) passing \[{{H}_{2}}S\] in dry mixture
Correct Answer: A
Solution :
On passing \[{{H}_{2}}S\] in acid medium \[C{{u}^{2+}}\]precipitated as \[CuS\] but \[N{{i}^{2+}}\] doesn't precipitated in acid medium.
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