Question

i. What are allotropes? 

ii. Name various allotropes of carbon.

Answer 1

i. When a solid element exists in different crystalline forms with different physical properties such as colour, density, melting point, etc. the phenomenon is called allotropy and the individual crystalline forms are called allotropes.

ii. Diamond, graphite, fiillerenes, graphene and carbon nanotubes are various allotropes of carbon.