Balance the following equations and determine which type of reaction is occurring.

Balance the following equations and determine which type of reaction is occurring.
1. (NH4)2CO3 (s) →NH3+H2O+CO2 (g)
2. Zn (s) +H3C6H5O7 (aq) →Zn3(C6H5O7)2 (aq) + H2 (g)
3. Zn(C2H3O2)2 (aq) + Na3PO4 (aq) → NaC2H3O2 (aq) + Zn3(PO4)2 (s)