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Oleum is H2S2O7 (H2SO4 + SO3) which is obtained by dissolving SO3 in H2SO4 and is called fuming sulphuric acid.

1. S + O2 → SO2 (burns with blue light)
2. 4Na + O2 → 2NaO (burns with yellow light)
3. P4 + 3O2 → P4O6
4. P4 + 5O2 → P4O10

Correct answer: S + O2 → SO2 (burns with blue light)

Solution

The reaction S + O2 → SO2 is the first step in the production of oleum, as SO2 is further oxidized to SO3, which dissolves in H2SO4 to form oleum.

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