Which of the following types of carbon consists of one-atom-thick planar sheets of carbons?
a. buckyballs.
b. nanotubes.
c. graphene.
d. graphite.

c. graphene.

Explanation:

Graphene -

It is one of the allotropic form of the carbon atom , which consists of one single layer of atoms , that are linked in a two dimensional fashion , is referred to as graphene .

It is a form of very large aromatic molecule .

Graphene is structural element of the allotropes likes , fullerene , charcoal , graphite and carbon nanotubes .

Hence , from the given information of the question ,

The correct option is c. graphene .

i need mutiple choices

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.