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2 Mg + CO₂ --> 2 MgO + C
Hg + 4 HNO₃ --> Hg(NO₃)₂ + 2 NO₂ + 2 H₂O
Cu + 2 H₂SO₄ --> CuSO₄ + SO₂ + 2 H₂O
SiO₂ + 2 H₂ --> Si + 2 H₂O