1. Fe + 3KOH = Fe(OH)₃ + 3K
2. Ca(NO₃)₂ + 2HCl = 2HNO₃ + CaCl₂
3. KOH + 2HNO₃ = KH(NO₃)₂ + H₂O
4. Na₂SO₄ + BaCl₂ = BaSO₄ + 2NaCl
1. Fe + 3KOH = Fe(OH)₃ + 3K
2. Ca(NO₃)₂ + 2HCl = 2HNO₃ + CaCl₂
3. KOH + 2HNO₃ = KH(NO₃)₂ + H₂O
4. Na₂SO₄ + BaCl₂ = BaSO₄ + 2NaCl