a. 2K₃PO₄ + 3MgCl₂ ----> Mg₃(PO₄)₂ + 6KCl
- This is a double displacement reaction
- Potassium displaces Magnesium from magnesium chloride
- Magnesium displaces potassium from potassium phosphate
b. Fe + Na₂CO₃ -----> FeCO₃ + 2Na
- This is a redox reaction
- Iron undergoes oxidation, iron is oxidised to ferrous carbonate
- Sodium undergoes reduction, sodium is reduced from sodium carbonate to sodium metal
c. CH₄ + 2O₂ ------> CO₂ + 2H₂O
- This is a combustion reaction
- Methane undergoes combustion in the presence of oxygen to produce carbon dioxide and water
d. H₂ + Cl₂ -------> 2HCl
- This is a combination reaction
- Hydrogen gas and chlorine gas combine to form Hydrogen chloride gas
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