Question 3: Which of the following are redox reactions?
I. 2 N2 + 3 H2 → 2 NH3II. 4 Al + 3 O2 → 2 Al2O3III. 2 NO2 → N2O4IV. FeCl3 (aq) + 6 NH3(aq) → Fe(NH3)63+ (aq) + 3 Cl- (aq)V. Cu2+ + Zn → Cu + Zn2+
a) I, II, and IV
b) I, II, and V
c) I and II
d) I, IV, and V
e) All but III
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