A) \[Na>Mg>Zn>Fe>Cu\]
B) \[Cu>Fe>Zn>Mg>Na\]
C) \[Mg>Zn>Na>Fe>Cu\]
D) \[Zn>Na>Mg>Fe>Cu\]
Correct Answer: A
Solution :
[a] The reactivity may be attributed to size factor, larger is the size, higher is tendency to lose electron (low I.E.). \[Zn\] is the last element of \[3d\] series and it has larger size than Cu due to \[(3{{d}^{10}}4{{s}^{2}})\] configurations. Hence, the reactivity order is \[Na>Mg>Zn>Fe>Cu.\]
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