Chemistry - Chemical Bonding and Molecular Structure
Practise 15 IAT (IISER) previous year questions on Chemical Bonding and Molecular Structure, compiled from papers spanning 2017 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty IAT (IISER) tests.
Chemical Bonding and Molecular Structure has been asked in 9 of the 9 years of IAT (IISER) papers analysed (2017–2026), with 15 questions in all. 20% of them were easy, 80% moderate and 0% tough. Most of its questions came from 2026, with 2 questions that year. In the last three years (2023–2026) it had 5 questions across 3 papers, about 1.7 per paper.
The chapter's 4 topics are not weighted equally: Molecular Orbital Theory (6 questions, 40%), Dipole moment (3 questions, 20%), and Covalent and Co-ordinate Bonding (3 questions, 20%) have been asked the most. Molecular Orbital Theory has also led over the last five years, with 4 questions.
- 1Which one of the following molecules shows an increase in bond order after loss of an electron from the highest occupied molecular orbital?2026Molecular Orbital Theory
- 2What is the order of bond energy between C=S C=Te, and between Cl–Cl F–F?2026Covalent and Co-ordinate Bonding
- 3Which among the following processes is/are associated with increasing bond order but no change in diamagnetic/paramagnetic behaviour? (i) (i2025Molecular Orbital Theory
- 4The dipole moments of three -type molecules , and are measured to be , and 1.5 D , respectively. Which one of the following options is corre2025Dipole moment
- 5Which one of the following statements is correct about , and ?2024Molecular Orbital Theory
- 6According to the VSEPR theory, what are the most stable shapes of and , respectively?2024Hybridisation and VSEPR Theory
- 7Amongst , and , which molecules will be attracted to an external magnetic field?2023Molecular Orbital Theory
- 8Identify the correct order of the molecules with respect to the magnitude of their dipole moment:2022Dipole moment
- 9The F-P-Cl bond angles in the most stable structure of are close to2021Hybridisation and VSEPR Theory
- 10The correct statement about the bond angles and bond lengths in is terminal bridging Cl2021Hybridisation and VSEPR Theory
- 11What is the most appropriate Lewis structure of ?2020Covalent and Co-ordinate Bonding
- 12What are the correct orders of bond lengths and bond dissociation enthalpies for and ? (where or Cl )2019Molecular Orbital Theory
- 13A molecular adduct is formed between and . Which of the following values describe the coordination number ( CN ), valency ( V ) and oxidatio2019Covalent and Co-ordinate Bonding
- 14Which of the following statements is valid for the dipole moment (\( \)) values of cis- and trans- \( {F}_2 {~N}_2\) ?2018Dipole moment
- 15How many nodes are there in the antibonding molecular orbital formed by two atomic orbitals?2017Molecular Orbital Theory
Frequently Asked Questions
1.How many questions are available for Chemical Bonding and Molecular Structure?
This chapter includes 15 questions compiled from IAT (IISER) papers spanning 2017 to 2026.
2.Are these questions only from IAT (IISER), or from other exams too?
These are IAT (IISER) questions specifically for the Chemical Bonding and Molecular Structure chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.
3.Is Chemical Bonding and Molecular Structure an important chapter for IAT (IISER) Chemistry?
Chemical Bonding and Molecular Structure has appeared in 10 of the 10 years of IAT (IISER) papers covered here, with 15 questions across 10 papers - about 2 per paper it appears in.
4.What is the difficulty level of Chemical Bonding and Molecular Structure questions in IAT (IISER)?
Of the 15 questions analysed for this chapter, 20% are easy, 80% moderate and 0% tough. 2026 had the most, with 2 questions.
5.Which topics in Chemical Bonding and Molecular Structure should I focus on?
These topics have carried the most weightage in Chemical Bonding and Molecular Structure:
- Molecular Orbital Theory - 6 questions (40%)
- Dipole moment - 3 questions (20%)
- Covalent and Co-ordinate Bonding - 3 questions (20%)
6.Is Chemical Bonding and Molecular Structure's weightage in IAT (IISER) going up or down?
Across all 10 papers analysed, Chemical Bonding and Molecular Structure has averaged about 1.5 questions per paper. In the last three years (2023–2026), that average has stayed about the same, at about 1.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.