Which of the following is NOT an oxidation-reduction reaction?
a) H2O + SO2 -> H2SO3
B)N2 +O2 -> 2NO
c)H2 + Cl2 -> 2HCl
d) 2NaBr + Cl2 -> 2NaCl + Br2
a) H2O + SO2 -> H2SO3
B)N2 +O2 -> 2NO
c)H2 + Cl2 -> 2HCl
d) 2NaBr + Cl2 -> 2NaCl + Br2
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(a) is NOT an oxidation-reduction reaction. None of the elements in the reaction has either lose or gain their oxidation number.