Posted by Sandy on Monday, July 11, 2011 at 1:25pm.
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
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