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C(C is correct. The reaction described in the question stem is shown below:2 SO2 + O2 → 2 SO3The presence of large amounts of oxygen are an initial hint that oxidation may be taking place, but we can confirm this by the fact that the oxidation number of sulfur changes from +4 to +6. Oxidation is the loss of electrons, which is precisely what occurs when oxidation state becomes more positive. Thus, Roman numeral I is accurate. This reaction is also a combination reaction, since two reactants combine to form a single product. However, this is not a substitution, since no part of SO2 is actually replaced.)
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