A) \[Ag\]
B) \[Zn\]
C) \[Cu\]
D) None of these
Correct Answer: C
Solution :
\[C{{u}^{2+}}+{{H}_{2}}S\underset{\,\,\,\,\,\,\text{black ppt}\text{.}}{\mathop{\to CuS\downarrow }}\,\]
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