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 \[\text{CuS}{{\text{O}}_{\text{4}}}\]solution. (ii) Pb, Zn and Fe react with \[\text{aq}\text{. CuS}{{\text{O}}_{\text{4}}}\]because they are placed above Cu
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