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Based on the equations below,which metal is the most active?
Pb(NO3) 2 (aq) + Ni (s) → Ni(NO3) 2 (aq) + Pb (s)
Pb(NO3) 2 (aq) + Ag (s) → No reaction
Cu(NO3) 2 (aq) + Ni (s) → Ni(NO3) 2 (aq) + Cu (s)
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