Sulfur dioxide gets reacts with water vapor to produce aqueous hydrogen sulfite.

SO₂ +  H₂O → HSO₃⁻ + H⁺

Explanation:

Assuming, you want to know the final balanced equation of this reaction, which is in words.

Sulfur dioxide reacts with water vapor to produce aqueous hydrogen sulfite and H⁺ ions(acidic).

Sulfur dioxide: SO₂(g)

Water vapor: H₂O(g)

Hydrogen sulfite: HSO₃⁻(aq)

Before putting them in the equation, check for each element's oxidation state to identify the nature of the reaction.

OS of S in SO₂ is +4, and in HSO₃⁻ is also +4.

OS of H and O remain +1 and -2, respectively.

SO₂ +  H₂O → HSO₃⁻ + H⁺

This further reacts to form sulfur trioxide (SO₃) gas, which is main cause for acid rain, as this reacts with water vapor in atmosphere to form sulfuric acid.

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