Clearing IIT JEE is a cherished dream of every enthusiastic engineering aspirant. It is so hard and only a few are able to make it. The three subjects are included in it—Physics, Mathematics, and Chemistry. Among these three, Chemistry is one of the subjects that holds great importance for students. It has a vast concept and students need to have a thorough study of it. We are covering one of the important topics in the subject here – Structure of Diamond. It is one of the lessons in Chemistry subjects that students need to study with undivided attention.
Update – The IIT JEE Advanced exam for the year 2020 was scheduled to be held on 17th May 2020. However, due to the Coronavirus situation, the exam has been postponed. The new exam dates are yet to be announced.
Aspirants are advised to clear the concepts from the NCERT books. All the previous years’ qualifiers suggest NCERT as the best books for understanding the basic concepts. Candidates can further refer to other books for in-depth knowledge.
What is a diamond in Chemistry?
In Chemistry subject, Diamond is an allotrope of carbon. It consists of carbon atoms with various physical characteristics. As far as its atomic structure is concerned, its atoms are bound together by strong covalent bonds with different arrangements.
Structure of Diamond
All the carbon atoms of Diamond have strong chemical bonds with four other carbon atoms, thereby making a complete tetrahedron structure. The carbon atoms are sp3 hybridized and the bonds between lengths of a carbon-carbon atom are equal. So, Diamond forms a 3-dimensional network of strong covalent bonds. Its melting point is about 3843 K and density as high as 3.51 g/cm3. It is a poor conductor of electricity as its valence electrons get involved in C-C sigma covalent- bonds. As a result of this, they are localized and do not conduct electricity.
Chief Characteristics of Diamond
There are four chief characteristics of Diamonds—transparency, colour, lustre and dispersion of light. The amazing thing about it is that it remains transparent and clear in its pure carbon form. Uncut Diamonds have a greasy lustre and do not appear brilliant. But, when it is trimmed, shows a high lustre.
What does Diamond comprise?
It comprises the lowest element that can build covalently bonded crystal lattice, which is tightly bound and symmetric. Its geometric crystallography derives its importance from the fact that the external form of a crystal discloses the symmetry characters of its internal structure. Apart from natural occurrence, Diamonds can be made synthetically under high pressure and high temperature, which creates conditions in the mantle of Earth.
Applications and uses
- Diamond, the hardest substance found on the Earth, is used for making many tools, which are used for cutting, grinding, drilling etc.
- It is used in the manufacturing of filaments made of tungstens used in light bulbs.
- It is used for making costly jewellery, worn by rich people.
- Since it is a high precision instrument, it is also used by surgeons while removing the cataract from people’s eyes.
Study of the structure of Diamond in JEE
The study of the structure of Diamond is a theory based on JEE. Students need to study thoroughly for this. The structure of Diamond is a complicated one and they should draw its figure and understand its atomic structure. They should learn its definition and its various uses and applications. Questions asked in JEE Advanced will be objective type and students are required to tick the right answer. There is negative marking. So, in case students are not clear about questions, they should not make guesses.