Multiple choice

Most of the common fuels are either free carbon or carbon compounds. Which of the following common fuels contain free carbon?

a. Petrol b. Coal c. Kerosene d. Charcoal

  1. Only a and b

  2. Only b and c

  3. Only a and c

  4. Only b and d

  5. Only a and d

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

This is the correct option. Coal and charcoal contain free carbon.