1) 4K + O2 = 2K2O – this reaction refers to combination reactions, potassium is oxidized by oxygen, and potassium oxide is formed.
2) К2О + Н2О = 2KOH – this reaction refers to combination reactions, potassium oxide reacts with water, and potassium hydroxide is formed.
3) 2KOH + H2SO4 = K2SO4 + H2O – this reaction refers to exchange reactions, potassium hydroxide reacts with sulfate acid, and potassium sulfate and water are formed.
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