Maharashtra State PSC Model Paper 3

The Correct answer is All of these.

• It is a hard, beautiful, crystalline allotrope of carbon.
• In an atom, each carbon atom is linked to four neighbouring carbon atoms.
• These have tetrahedral three-dimensional symmetry.
• Diamond doesn't have free electrons. So. it is a non-conductor of electricity.
• Diamond is a precious stone used in jewellery.

Graphite-

• It is a soft greyish black crystalline substance.
• It was discovered in 1795 by scientist 'Nicholas Jacques Conte'.
• Its's density is 1.9 to 2.3 g/cm3.
• Each carbon atom is attached to three other carbon atoms forming a 'Hexagonal planar structure'.
• Free electrons move through the layers of graphite, so graphite is a good conductor of electricity.

Fullerene-

• This is a newly known allotrope of carbon and also known as Bucky Ball.
• Its C-60 type of carbon atoms area attached in Pentagonal-Hexagonal structure.
• Scientist Richard Buckminster gave this name to the allotrope according to the circular structure of carbon.
• It is also used as Lubricants.