Question

Inorganic graphite is
A.${B_3}{N_3}{H_6}$
B.${B_3}{N_3}$
C.$SiC$
D.$Fe{\left( {CO} \right)_5}$

Answer 1

Graphite is an allotropic form of carbon having layered structures and carbon atoms bonded to each other in $s{p^2}$ hybrid state. Inorganic graphite has a similar structure as graphite but is inorganic, i.e., not made up of carbon.

Complete answer:
Graphite is an allotropic form of carbon which is opaque and greyish black in colour.
The carbon atom in graphite has an $s{p^2}$ hybridisation and is bonded to three other carbon atoms resulting in the formation of hexagonal rings, each atom consists of an unhybridized p orbital which undergoes sideways overlapping forming three $p\pi - p\pi$ bonds with the three adjacent carbon atoms. As a result, graphite has a sheet like planar structure composed of a number of hexagonal sheets fused together. This sheet like structure of the allotrope makes it a soft material.
Boron nitride has many structures, namely, amorphous form, cubic form and hexagonal for. In the hexagonal form, boron nitride has a layered structure similar to that of graphite. These planar layers of boron nitride are held together by weak Van der Waals forces. However it differs a little from graphite layers as the atoms in the boron nitride layers are eclipsed. In other words, the boron atoms lie above the nitrogen atoms.
Thus, boron nitride $\left( {BN} \right)$ or $\left( {{B_3}{N_3}} \right)$ has similar physical properties as graphite and is known as inorganic graphite.

Thus, the correct answer is B.
Note:
Boron nitride should not be confused with borazine. Borazine is known as inorganic benzene since it has a structure similar to benzene whereas boron nitride is known as inorganic graphite.