1. CH4 + 2O2 → 2CO2 + 2H2O = Balanced or Unbalanced
2. SnO2 + 2H2 → Sn + H2O = Balanced or Unbalanced
3. 4Al + 3O2 → 2Al2O3 = Balanced or Unbalanced
4. N2 + 3H2 → NH3 = Balanced or Unbalanced
5. 2Zn + 2HCl → ZnCl2 + H2 = Balanced or Unbalanced
6. 4FeS + 7O2 → 2Fe2O3 + 4SO4 = Balanced or Unbalanced
7. 2 AgI + Na2S → 2Ag2S + 2NaI = Balanced or Unbalanced
8. Ca3 (PO4) + 2H2SO4 → 2 CaSO4 + Ca (H2PO4) 2 = Balanced or Unbalanced
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