Correct Answer is Option (B)
ZnCl2 solution cannot be kept in contact with Al without losing its concentration because Al is more reactive than Zn due to its highly negative electrode reduction potential.
Topic 2 : Redox Reactions in terms of Electron Transfer
1. Without losing its concentration; ZnCl2 solution cannot be kept in contact with... ⇒ (1998)
A. Au
B. Al
C. Pb
D. Ag