Various allotropes are gven in the box.
[Diamond, Wood charcoal, sugar charcoal, graphite, lamp back]
a) What is meant by allotrophy?
b) Which are the crystalline allotropes of carbon from the compounds given above?
c) Mention one use of any of these crystalline allotropes.

Explanation

a) The phenomenon in which the same element exists I different forms is called allotrophy.
b) Diamond, Graphite
c) Diamond - used for making ornaments or for cutting glass.
Graphite - for making pencil lead or used as an solid lubricant.