Question

37) Why is graphite used as a major component in pencil lead

Answer 1

Graphite: Graphite is an allotrope of carbon and has a highly soft texture (because the structure of graphite contains layers and these layers are able to slide over each other) and is lustrous.

Reason graphite being used as pencil Lead

Since graphite is highly lustrous and imparts an impression on paper when used, which other materials can't do so, hence graphite is used as a pencil lead.