Multiple choice

Which of the following is INCORRECT?

  1. Diamond is covalent network solid which is hardest substances.

  2. Graphite is soft and slippery, and can act as a lubricant.

  3. Carbon Black is amorphous allotropy of carbon.

  4. Carbon dioxide is a gas, which is used as fire extinguisher.

  5. Fullerenes form another class of carbon allotropes, C-50 was the first fullerene to be identical.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Fullerenes form another class of carbon allotropes. The first one to be identified was C-60, which has carbon atoms arranged in the shape of a football. It contains 5 ring membered and six ring membered of carbon atoms.

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