Answer:
Combination
Explanation:
In combination reaction two or more elements combine to give one compound.
X + Y → XY
Combustion:
Combustion involve the burning of compounds. In combustion mostly hydrocarbons burn in the presence of oxygen and produce water, carbon dioxide and heat.
CH₄ + 2O₂ → CO₂ + 2H₂O + heat
Decomposition:
In decomposition reactions compounds are break into two or more products.
AB → A + B
Displacement:
In displacement reactions one element replace the other in compound.
AB + C → AC +B
