classify the reactions below as synthesis, decomposition, single replacement(cationic or anionic) or double replacement

1. 2H-2 + O2 --> 2H-2O

2. 2H-2O --> 2H 2 + O-2

3. Zn + H-2SO-4 --> ZnSO-4 + H-2

4. 2CO + O-2 --> 2CO-2

5. 2HgO --> 2Hg + O-2

6. 2KBr + CI-2 --> 2KCI + Br-2

7. CaO + H-2O --> Ca(OG)-2

8.AgNO-2 + NaCI --> AgCI + NaNO-3

9. 2H-2O-2 --> 2H-2O + O-2

10. Ca(OH)-2 + H-2SO-4 --> CaSO-4 + 2H-2O