Multiple choice

What should be the state of a substance to undergo combustion?

  1. Solid or liquid

  2. Liquid or gas

  3. Solid, Liquid or gas

  4. Only liquid

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Combustion can occur in all three states of matter. Solid fuels like wood and coal burn, liquid fuels like petrol and alcohol burn, and gaseous fuels like natural gas and LPG burn. The physical state does not prevent combustion if the ignition temperature is reached.

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