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Dilute nitric (V) acid reacts with copper according to the equation;
#3CU_((s)# +# 8H^+(aq)# + #2NO_3(aq)# #rightarrow# #3Cu^(+2)(aq)# + 2NO(g) + #4H_2 O(l)#
(a) What is the oxidation number of nitrogen in
(i) #NO_3^-#
(ii) NO
(b) With respect to nitrogen, explain whether the above reaction is an oxidation or reduction process.