Which allotrope of carbon is used in making 'lead' of pencils?

Q. Which of the following substances are crystalline allotrope of carbon?
(i) Diamond (ii) Charcoal (iii) Graphite (iv) Lamp black (v) Coke (vi) Fullerene

Q. The hybridization of carbon in diamond, graphite and fullerene is respectively:

Q. Consider the three allotropes of carbon :

(i) Diamond
(ii) Graphite
(iii) Fullerenes ($C_{60}$)

The hybridisation state of C-atom in the three allotropes are respectively

Q. The hybridization of Carbon in Diamond . Graphite and Fullerenes respectively