which of the following is reduced in the reaction:

Question

Cu(NO3)2 + Zn --- Zn(NO3)2 + Cu

Answer 1

Reduction is the gain of electrons. Which gains electrons?
I'll help a little with oxidation states. On the left, Cu is +2, N is +5, O is -2, Zn is zero EACH.
On the right, Zn is +2, N is +5, O is -2, and Cu is zero