S -> SO₂ -> H₂SO₃ -> K₂SO₄

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This is a series of chemical reactions that starts with S and ends with K2SO4.

Sulfur (S) reacts with oxygen (O2) to form sulfur dioxide (SO2).Sulfur dioxide (SO2) can further react with water (H2O) to form sulfurous acid (H2SO3).Sulfurous acid (H2SO3) can react with potassium hydroxide (KOH) to form potassium sulfite (K2SO3).Finally, potassium sulfite (K2SO3) can react with potassium chloride (KCl) to form potassium sulfate (K2SO4).

Overall, the reactions occur in the following order: S -> SO2 -> H2SO3 -> K2SO4.