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2 Ca + O₂ ----> 2 CaO
CaO + H₂O ----> Ca(OH)₂
A - CaO tlenek wapnia
B - Ca(OH)₂ wodorotlenek wapnia
2.
2 S + 3 O₂ ----> 2 SO₃
SO₃ + H₂O ----> H₂SO₄
C - S siarka
D - SO₃ tlenek siarki (VI)