Chemistry is considered to be one subject which most JEE aspirants hate. There are several topics which are exceedingly difficult and need deep understanding skills in order to master. One such topic is the chapter on chemical bonding. Many students tend to face difficulty in understanding mole concept and the JEE paper setters know it. So, it is not uncommon to see a bunch of questions from this chapter every year in both JEE Main and JEE Advanced.
What makes Chemical Bonding difficult?
This chapter is a mix of mathematics and theory. On one hand, Bohr’s model involves quite a bit of Physics and mathematics, on the other hand, the VSEPR theory is purely theoretical. There are a lot of standard rules which are supposed to be known by the students. Moreover, there are also exceptions to the rules and students are expected to recall these exceptions at appropriate situations and change their inference depending on these exceptions. All of these intricacies make chemical bonding one of the tough topic to deal with.
What can be done to tackle it?
Each topic under the chemical bonding chapter needs different type of skills and so it is better to talk about each topic separately.
> Bohr’s Model: Some students feel overwhelmed with the number of formulae and the length of derivations involved in Bohr’s Model of Hydrogen atom and so, they simply cram all of it.
However, students should try to understand the derivations because often questions are asked in JEE which involve a slight variation of original derivation and the students are expected to repeat the complete derivation and reach a new conclusion. For example, a good question can be like this: what happens to the speed of the electron in the third Bohr’s orbit of the mass of an electron is doubled?
> Standard rules and principles: This includes the concept of wave particle duality, Uncertainty principle, and other principles like Aufbau’s rule, Hund’s rule, etc. Most students face a hard time understanding wave particle duality. It is better to not delve into this in great detail because not much is asked in JEE about the details of wave particle duality. Focus should be laid on the rules to deduce the electronic configuration of an atom. Electronic configurations of atoms up to atomic number 36 are expected to be known by the students. Students are also expected to know the exceptions in electronic configuration.
> Theories of bonding: It is important to understand the differences between the various theories of chemical bonding and also, how each theory progresses over the previous one to explain the practical observations. Also, it is important to note down the exceptions to each of the theory. It is also important to properly get a grasp of Molecular Orbital Theory because quite a few questions are asked from it.
We hope that this article helps you to understand this chapter better.
About the Author
|Aman Goel is B.Tech, computer science and engineering undergraduate student at Indian Institute of Technology, Bombay. Born in a business oriented family of Kanpur he secured an All India Rank 33 in JEE advanced 2013 and also scored 323/360 in JEE main 2013. He has also cleared Indian National Physics and Chemistry Olympiads, and KVPY. In his free time, he likes to write articles related to JEE preparation. He loves speedcubing (the art of speed solving a Rubik's cube) and also loves to play computer/mobile games.|