Atomic carbon is a very short-lived species and, therefore, carbon is stabilized in various multi-atomic structures with different molecular configurations called allotropes. The three relatively well-known allotropes of carbon are amorphous carbon, graphite, and diamond. Diamond is harder than graphite because of

difference of layers of atoms

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tetrahedral structure of diamond

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difference of crystalline structures

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none of the above

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Solution

The correct option is C difference of crystalline structures
Option: (c)

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Q. Assertion :

Diamond and graphite are allotropes of carbon.

Reason: Some elements can have different structural forms called allotropes.

What are allotropes? Sketch the structure of two allotropes of carbon namely diamond and graphite. What is the impact of structure on physical properties of two allotropes?

Q. The phenomenon of the existence of a chemical element in two or more forms differ in physical properties but of the same chemical nature is known as Allotropy. Carbon has two major allotropes diamond and graphite and the third one is Buckminsterfullerene. Diamond has a three-dimensional network of covalent bonds and is hard. In graphite, the carbon atoms are arranged in flat parallel layers as regular hexagons resulting in soft and ________ nature.

Q. Assertion :Diamond is the hardest crystalline form of carbon. Reason: Carbon atoms in diamond are tetrahedral in nature.

Q. Consider the following statements:
I: In diamond, each carbon atom is linked tetrahedrally to four other carbon atoms by

s p^{3}

bonds.
II: Graphite has planar hexagonal layers of carbon atoms held together by weak van der Waal's forces.
III: Silicon exists only in diamond structure due to its tendency to form

p π - p π

bonds to itself.

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The correct option is C difference of crystalline structures Option: (c)

The correct option is C difference of crystalline structures
Option: (c)