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K + HNO3 ---> KNO3 + 1/2 H2
Ca + H2SO4 ---> CaSO4 + 1/2 H2
2NaOH + H2CO3 --> Na2CO3 + 2H2O
2K + 2HNO₃ ---> 2KNO₃ + H₂
Ca + H₂SO₄ ---> CaSO₄ + H₂
2NaOH + H₂CO₃ --> Na₂CO₃ + 2H₂O