Расставьте коэффициенты, укажите типы химических реакций.
1) MgO + CO2  MgCO3;
2) NO2 + O2 + H2O  HNO3;
3) Na2O + H2O  NaOH;
4) KClO3  KCl + O2;
5) CO + O2  CO2.
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