1. Zinc + Hydrochloric acid → Zinc chloride + Hydrogen [Zn + 2 HCl → ZnCl2 + H2] is an example of   simple displacement reaction   decomposition reaction   synthesis or direct combination reaction   double decomposition reaction   Hint Half-n-half Clue   2. Calcium chloride + Sodium carbonate → Calcium carbonate + Sodium chloride [CaCl2 + Na2CO3 → CaCO3 + 2 NaCl] is an example of   double decomposition reaction   simple displacement reaction   synthesis or direct combination reaction   decomposition reaction   Half-n-half Clue   3. Iron + Sulfur → Iron sulfide [Fe + S → FeS] is an example of   simple displacement reaction   double decomposition reaction   synthesis or direct combination reaction   decomposition reaction   Half-n-half Clue   4. Magnesium + Oxygen → Magnesium oxide [2 Mg + O2 → 2 MgO] is an example of   synthesis or direct combination reaction   decomposition reaction   double decomposition reaction   simple displacement reaction   Half-n-half Clue   5. Water (+ electric current) → Hydrogen + Oxygen [2 H2O → 2 H2 + O2] is an example of   synthesis or direct combination reaction   simple displacement reaction   decomposition reaction   double decomposition reaction   Half-n-half Clue   6. Sodium oxide + Water → Sodium hydroxide [Na2O + H2O → 2 NaOH] is an example of   decomposition reaction   synthesis or direct combination reaction   double decomposition reaction   simple displacement reaction   Half-n-half Clue   7. Iron + Sulfuric acid → Ferrous sulfate + Hydrogen [Fe + H2SO4 → FeSO4 + H2] is an example of   simple displacement reaction   synthesis or direct combination reaction   double decomposition reaction   decomposition reaction   Half-n-half Clue