October 2021 1 16 Report
В схеме превращений +А +Б  MgO →MgCl2→Mg(OH)2 веществами А и Б являются соответственно: 
1) А – HCl, Б – O2
2) А – NaOH, Б – HCl
3) А – HCl, Б – NaOH 
4) А – Cl2, Б – H2O
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