[eLg]

Will Pb(NO3)2 + Cu has a reaction? if so, what will it be?

I think it has a reaction:
Pb(NO3)2 + Cu ---> Pb(NO3)2 + Cu ------ Cu(NO3)2 + Pb

However, the activity series of metal shows that Cu cannot replace Pb.

Please explain...

[Arkcon]

Will Pb(NO3)2 + Cu has a reaction? if so, what will it be?

Let's see

I think it has a reaction:
Pb(NO3)2 + Cu ---> Pb(NO3)2 + Cu ------ Cu(NO3)2 + Pb

Why does your proposed reaction have a middle step doesn't do anything?

However, the activity series of metal shows that Cu cannot replace Pb.

Please explain...

So why do you think there is a reaction?

[eLg]

oh that was a typo...sorry
Pb(NO3)2 + Cu ---> Cu(NO3)2 + Pb

I don't think there is a reaction because lead is above copper in the activity series. Thus, copper cannot replace lead...