Which of the following can undergo

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Question:
Which of the following can undergo a chemical reaction ?

(a) MgSO4 + Zn

(b) ZnSO4 + Fe

(c) CaSO4 + Pb

(d) CuSO4 + Al

Solution:

(d). Only Al can displace Cu from CuSO4 solution since it is placed above Cu in the activity series.