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2. 4 Na + O₂ ---> 2 Na₂O
3. 2 Na + 2 H₂O ---> 2 NaOH + H₂
4. Na₂O + H₂O ---> 2 NaOH
5. 2 H₂ + O₂ ---> 2 H₂O
A - O₂ - tlen
B - NaOH - wodorotlenek sodu
C - H₂ - wodór
D - NaBr - bromek sodu