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Question

Combustion is a reaction in which a substance reacts with:
  1. Nitrogen
  2. Hydrogen
  3. Oxygen
  4. Chlorine

A
Hydrogen
B
Nitrogen
C
Oxygen
D
Chlorine
Solution
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Combustion is a chemical process where substance reacts with Oxygen to give off a lot of heat. So combustion reactions involve molecular oxygen O2. When wood burns, it must do so in the presence of O2.

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