Allotropes of Carbon


 
 
Concept Explanation
 

Allotropes of Carbon

 Allotropy is the property by virtue of which an element exists in more than one form and each form has different physical properties but identical chemical properties. There are different forms atoms called allotropes. Allotropes may show differences in chemical and physical properties.

Properties of Allotropes :-

  • Allotropes are various structural types of the same element and therefore can exhibit different physical and chemical properties.
  • The allotropic forms  change is caused by the same forces that influence other structures, namely light, pressure and temperature.
  • Thus, the stability of the different allotropes relies on specific conditions.
  • Diamond and graphite have different appearances, hardness values, melting points, boiling points, and reactivities.
  • Some elements have multiple allotropes in the solid phase, but one liquid and gas form.
  • Examples of Allotropes :-

    Carbon Allotropes :- Allotropes of carbon can be divided into two categories :-

    Crystalline form :- Diamond, Graphite, Fullerene

    Micro - crystalline form or amorphous form :- Coal, Lampblack and charcoal

    Sample Questions
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    Question : 1

    Allotropes of elements are formed due to influence of _______________

    Right Option : D
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    Question : 2

    Which of the following is the hardest allotrope of Carbon?

    Right Option : A
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    Question : 3

    Which of the following allotropes consists of 60 carbon atoms arranged as 12 pentagons and 20 hexagons?

    Right Option : C
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