14HCl+K₂Cr₂O₇===2KCl+2CrCl₃+3Cl₂↑+7H₂O

Cl₂+SO₂+2H₂O===4H⁺+SO₄^2–+2Cl^–

3S+6NaOH  2Na₂S+Na₂SO₃+3H₂O

6HCl+KClO₃===KCl+3Cl₂↑+3H₂O

SiO₂ + 2NaOH == Na₂SiO₃ + H₂O