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2. HgO + Mg ---> Hg + MgO
3. O₂ + 2 H₂ ---> 2 H₂O
4. H₂O + Mg ---> MgO + H₂
A - Hg rtęć
B - O₂ tlen
C - MgO tlenek magnezu
D - H₂O woda