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2. H₂ + Cl₂ → 2HCl
3. Ca + Cl₂ → CaCl₂
4. Ca + 2HCl → CaCl₂ + H₂
5. O₂ + 2Ca → 2CaO
6. O₂ + 2H₂ → 2H₂O
A. H₂ wodór
B. Ca wapń
C. Cl₂ chlor
D. O₂ tlen