A) \[Pb\]
B) \[Ag\]
C) \[Zn\]
D) \[Fe\]
Correct Answer: B
Solution :
Key Idea: The element occupying higher position in electrochemical series displace those present below them. (i)\[\because \,\,Ag\] is placed below \[Cu\] in electrochemical series \[\therefore \,\,Ag\]does not react with \[CuS{{O}_{4}}\] solution. (ii) \[Pb,\,\,Zn\] and Fe react with \[aq.CuS{{O}_{4}}\] because they are placed above\[Cu\].
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