Which one of the following is NOT a redox reaction?
a. 2H2O2(aq) → 2H2O(l) + O2(g)
b. 2 Al(s) + Fe2O3(s)→ Al2O3(s) + 2Fe(s)
c. BaCl2(aq) +K2CrO4(aq) →BaCrO4(aq) + 2 KCl(aq)
d. 2 H2O(g) → 2H2(g) + O2(g)
e. N2(g) + 3 H2(g) → 2NH3(g)
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