I am not sure on how to identify reaction types. It is the only thing I need help with

Question

1. 3BaCl2 + 2Na3PO4 ---> 6NaCl + Ba3 (PO4)2
2. C6H12O6 + 6O2 ---> 6CO2 + 6H2O
3. 2H2 + O2 ---> 2H20
4. Zn + Pb(NO3)2 ---> Zn(NO3)2 + Pb

Answer 1

review the following reaction types:
synthesis, single displacment (some use "replacement"), combustion, double displacement. https://chemistry.tutorvista.com/inorganic-chemistry/types-of-chemical-reactions.html