Which one of the following is not an allotrope of carbon?

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Q: 7 (CDS-II/2016)

Which one of the following is not an allotrope of carbon?

question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,25,58,39,6,4,34

keywords: 

{'carbon': [1, 0, 4, 5], 'graphite': [0, 0, 3, 9], 'graphene': [0, 0, 0, 3], 'coal': [0, 1, 2, 0], 'allotrope': [0, 0, 0, 1], 'diamond': [0, 0, 3, 3]}

The correct answer is option 1: Coal. Coal is not an allotrope of carbon. An allotrope is a different form or structure of an element, in this case, carbon. Allotropes have different physical and chemical properties.

Option 2: Diamond is an allotrope of carbon. It is a naturally occurring form of carbon that is known for its hardness and clarity. It forms under high temperature and pressure and is made up of a three-dimensional arrangement of carbon atoms.

Option 3: Graphite is another allotrope of carbon. It is a soft, black, and slippery substance. It consists of layers of carbon atoms arranged in a hexagonal lattice structure.

Option 4: Graphene is also an allotrope of carbon. It is a single layer of graphite and is one of the thinnest and strongest materials known. Graphene has unique electronic properties and is being studied for a wide range of applications.

In summary, while coal is made up of carbon, it is not considered an allotrope of carbon. Allotropes of carbon include diamond, graphite, and graphene.