What are fullerenes? Name the most common fullerene.

What impurity is present in black diamond?

Write three differences between graphite and diamond.

Fill in the blanks:

(a) …………… is formed when charcoal is burnt in a limited supply of air.

(b) Coal is a …………… form of carbon.

(c) …………… is the most inferior form of coal.

(d) Wood charcoal is a …………… conductor of heat and electricity.

(e) …………… is used in making black shoe polish.