A chemical bond is described as an attractive force that keeps two atoms or ions together in a molecule. A molecule is formed when it is more stable and has lower energy than the individual atoms. Chemical bonding occurs when the electrons of the outermost shell participate in a chemical reaction to attain the electronic configuration of an inert gas. Chemistry is all about chemical bonding, the formation of new products and change in properties due to formation of new bonds. Hence this topic is of great significance. Even in JEE this topic carries high weight and should be dealt properly in order to obtain good marks. Questions asked in JEE generally follow a pattern and hence going through important topics at the last moment always helps.
Question 1: What are the important topics in chemical bonding that needs to be focused in order to crack JEE?
Answer: According to JEE syllabus the significant topics in chemical bonding are:
- Ionic bonding
- Covalent bonding
- Bond characteristics and Lewis theory
- Valence bond theory
- VSEPR theory
- Molecular orbital theory
- Covalent character in ionic bonds (Fajan’s Rule)
The topic of chemical bonding covers 5% marks in chemistry paper and these topics require a thorough understanding of the concepts.
Question 2: What types of concepts are generally tested in JEE?
Explain why BeH2 molecule has zero dipole moment although the Be-H bonds are polar?
Solution: BeH2 is a linear molecule (H-Be-H) with bond angle equal to 180o. Although the Be-H bonds are polar on account of electronegativity difference between Be and H atoms, the bond polarities cancel with each other. The molecule has resultant dipole moment of zero.
Question 3: Which books should be referred for chemical bonding while preparing for JEE?
Answer: Go through the NCERT chemistry textbook for class 11, this book contains all the details in a very precise way. NCERT is the most student-friendly book as it covers all the topics that are significant from examination point of view. Physical Chemistry by O. P. Tandon is another good book which can be used as a reference.
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