Answer :
Answer:
CH4+ 2O2 → CO2 + 2H2O:
✔ balanced
CaCl2+ 2AgNO3 → Ca(NO3)2 + 2AgCl:
✔ balanced
3Fe3O4 + 4Al → 9Fe + 4Al2O3:
✔ unbalanced
Explanation:

Answer:
CH4+ 2O2 → CO2 + 2H2O:
✔ balanced
CaCl2+ 2AgNO3 → Ca(NO3)2 + 2AgCl:
✔ balanced
3Fe3O4 + 4Al → 9Fe + 4Al2O3:
✔ unbalanced
Explanation: