Multiple choice

Which of the following forms of carbon occurs naturally?

  1. Coke

  2. charcoal

  3. asphalt

  4. diamond
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Diamond is a naturally occurring allotrope of carbon formed deep in the Earth's mantle under high pressure and temperature conditions. In contrast, coke and charcoal are produced artificially by heating coal or wood in limited oxygen, while asphalt is a petroleum-derived mixture containing hydrocarbons rather than pure carbon.

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