Question

Which one is not an allotrope of carbon?

• A. Diamond
• B. Soot
• C. Graphite
• D. Fullerene

Answer 1

The correct option is B

Soot

The explanation for the correct option:

Option (b):

• Soot is a black powder-like substance, which is not an allotrope of carbon.

The explanation for the incorrect option:

Option (a):

• Diamond is a 3-dimensional carbon structure which is an allotrope of carbon.
• it is the rigid and hardest substance known.

Option (c):

• Graphite has a layered structure and it is also found in crystalline form, which is an allotrope of carbon.
• It is slippery in nature.
• It is used as a lubricant.

Option (d):

• Fullerene is the third form of carbon allotrope that also belong to the crystalline form.
• The heating of graphite in an electric arc in the presence of inert gases gives the fullerene.

Final answer:

Hence, option (b) is the correct answer.