Classify as to what type of chemical reaction each one belongs:
1. H2CO3 → H2O + CO2
2. C6H1O6 → 12C + 11 H2O
3. CdCl2 + H2S → CdS + 2HCl
4. 2Al + O2 → Al2O3
5. Mg + H2SO4 → MgSO4 + H2
6. CaCO3 → CaO + CO2
7. Na2O + H2O → 2NaOH
8. FeCl3 + 3NaOH → Fe(OH)3 + 3NaCl
9. 3H2 + Fe2O3 → 3H2O + 2Fe
10. 2H2 + O2 → 2H2O