Is this chemical equation a RedOx reaction?

Question

SO₂ + H₂O = H₂SO₃

Answer 1

Look at the oxidation numbers of the elements on the left and right side of the equation.

SO₂ + H₂O = H₂SO₃

S is 4+ on the left and 4+ on the right

H is 1+ on both sides

O is 2- on both sides

This is NOT a redox reaction as nothing has changed oxidation number.