Multiple choice

Fuels are compounds of mostly __________.

  1. carbon and sulphur

  2. carbon and nitrogen

  3. carbon and hydrogen

  4. oxygen and hydrogen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fossil fuels like coal, petroleum, and natural gas are primarily composed of hydrocarbons - compounds containing only carbon and hydrogen atoms. These hydrocarbons store energy that is released during combustion.

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