Question

Which of the following Crisco properties of graphite?
(a)- It melts at ${{800}^{\circ }}C$
(b)- It is a smooth, crystal-lined form of carbon
(c)- It is a good conductor of electricity
(d)- It forms a black sign on paper

Answer 1

Graphite is also known as plumbago and it mainly constitutes a carbon element, due to which its formula is C. The pencil we use is made up of graphite.

Complete step by step answer:
There are many crystal forms of carbon and graphite is one of them. In crystalline form, it has a hexagonal structure. Since it has a hexagonal form, there are layers of carbon atoms in graphite. Graphite can convert into a diamond when it is suspended to very pressure and temperature. There are two most common applications of graphite, these are pencil and lubricants. In the layers of graphite, there is one electron in each layer that can move or has a mobile electron. Due to this electron, the graphite is a good conductor of heat and electricity and it can be used in batteries, solar panels, and electrodes.
The color of graphite is deep black color and it can be used to write on paper, that’s why it is used in pencils. Since it is an allotrope of carbon element, it has a very high melting point which is equal to ${{3230}^{\circ }}C$. The density of graphite is $2.09-2.23\text{ g/c}{{\text{m}}^{3}}$. It is only soluble in molten nickel.

So from the above discussion, the correct answers to this question are options (b), (c), and (d).

Note: The hybridization of carbon in graphite form is $s{{p}^{2}}$. Graphene is a name that is given to layers in graphite. Graphite is also known as black lead and is usually named for the powdered form of graphite.