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Chemistry - Chemical Bonding and Molecular Structure

Practise 87 AIIMS previous year questions on Chemical Bonding and Molecular Structure, compiled from papers spanning 2001 to 2019. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty AIIMS tests.

Chemical Bonding and Molecular Structure has been asked in 19 of the 19 years of AIIMS papers analysed (2001–2019), with 87 questions in all. 64% of them were easy, 30% moderate and 6% tough. Most of its questions came from 2001, with 11 questions that year. In the last three years (2017–2019) it had 23 questions across 5 papers, about 4.6 per paper.

The chapter's 9 topics are not weighted equally: Hybridisation and VSEPR Theory (30 questions, 34%), Molecular Orbital Theory (22 questions, 25%), and Van Der Waals Forces, Hydrogen Bonding and Metallic Bonding (9 questions, 10%) have been asked the most. Molecular Orbital Theory has produced the most tough questions (3).

  1. 1Select the correct statement regarding shapes of and .26 May, 2019Hybridisation and VSEPR Theory
  2. 2Which of the following is incorrect about cyanogen gas?26 May, 2019Hybridisation and VSEPR Theory
  3. 3Which is least soluble in water?26 May, 2019Characteristics of covalent compound
  4. 4Assertion : and are not isostructural. Reason : In , sulphur has one lone pair of electrons.26 May, 2019Hybridisation and VSEPR Theory
  5. 5Assertion : and both exist. Reason : Both have same valence electrons.26 May, 2019Hybridisation and VSEPR Theory
  6. 6Among the following, the number of compounds having zero lone pair of electrons on central atom is25 May, 2019Hybridisation and VSEPR Theory
  7. 7Which of the following statements about ion is correct?25 May, 2019Hybridisation and VSEPR Theory
  8. 8When reacts with excess of sodium thiosulphate then the obtained species have charge and geometry respectively25 May, 2019Hybridisation and VSEPR Theory
  9. 9Assertion : is predominantly a covalent compound. Reason : Electronegativity difference between and is too small.25 May, 2019Polarization
  10. 10Which of the following order is correct?27 May, 2018Dipole moment
  11. 11Which pair of molecules does not have identical structure?27 May, 2018Hybridisation and VSEPR Theory
  12. 12Which of the following pairs have different hybridisation and same shape? (i) and (ii) and (iii) and (iv) and27 May, 2018Hybridisation and VSEPR Theory
  13. 13Which of the following have same hybridisation but are not isostructural?27 May, 2018Hybridisation and VSEPR Theory
  14. 14Assertion : bonds are much stronger than bonds. Reason : Silicon forms double bonds with itself.27 May, 2018Characteristics of covalent compound
  15. 15Which of the following is correct regarding bond angles? (i) (ii) (iii) (iv)27 May, 2018Hybridisation and VSEPR Theory
  16. 16Which of the following pairs does not have same bond order?26 May, 2018Molecular Orbital Theory
  17. 17Which of the following has maximum of -character?26 May, 2018Hybridisation and VSEPR Theory
  18. 18Assertion : Surface tension of water is more than many other liquids. Reason : Water molecules have strong intermolecular -bonding as attrac26 May, 2018Van Der Waals Forces, Hydrogen Bonding and Metallic Bonding
  19. 19is polar, whereas is not because2017Dipole moment
  20. 20Which of the following electronic configurations has maximum energy?2017Covalent and Co-ordinate Bonding
  21. 21Hydride of boron occurs as but does not exist. This is because2017Back Bonding
  22. 22Assertion: The second dissociation constant of fumaric acid is greater than maleic acid. Reason : Higher the dissociation constant of acid, 2017Van Der Waals Forces, Hydrogen Bonding and Metallic Bonding
  23. 23Assertion: Both and MO's have one nodal plane each. Reason: All MO's formed by side way overlapping of -orbitals have one nodal plane.2017Molecular Orbital Theory
  24. 24Which of the following molecules has more than one lone pair?2016Hybridisation and VSEPR Theory
  25. 25Four diatomic species are listed below in different sequences. Which of these represents the correct order of their increasing bond order?2016Molecular Orbital Theory
  26. 26Assertion : bond angle is less than the normal tetrahedral bond angle. Reason : Lone pair-lone pair repulsion decreases bond angle.2016Hybridisation and VSEPR Theory
  27. 27Assertion : Diamagnetic substances are not attracted by magnetic field. Reason : Diamagnetic substances have no unpaired electrons.2016Molecular Orbital Theory
  28. 28Assertion : Molecular nitrogen is less reactive than molecular oxygen. Reason : The bond length of is shorter than that of oxygen.2015Molecular Orbital Theory
  29. 29In molecule, the formal charge on the central -atom is2014Molecular Orbital Theory
  30. 30Which of the following represents the correct bond order?2014Molecular Orbital Theory
  31. 31Assertion : has higher bond length than . Reason: is paramagnetic.2014Molecular Orbital Theory
  32. 32Total number of antibonding electrons present in will be2013Molecular Orbital Theory
  33. 33Which of the following ion does not exist?2013Molecular Orbital Theory
  34. 34Assertion : Bond lengths of bonds in gaseous and solid are not equal. Reason : Because in solid state two molecules are associated.2013Hybridisation and VSEPR Theory
  35. 35Assertion : cis-3-chloroprop-2-enoic acid is less stable than its trans-form. Reason : Dipole moment of cis-form is greater than trans-form.2013Dipole moment
  36. 36Which is not stable under ambient condition?2012Molecular Orbital Theory
  37. 37The dipole moment is minimum in2012Dipole moment
  38. 38Assertion : has T-shape structure. Reason : It has two lone pairs arranged at angle.2012Hybridisation and VSEPR Theory
  39. 39Assertion : is paramagnetic. Reason : It has one unpaired electron.2012Molecular Orbital Theory
  40. 40Assertion : is more basic than . Reason : Size of increases and shows more covalent character.2012Polarization
  41. 41In solid ice, oxygen atom is surrounded2011Hybridisation and VSEPR Theory
  42. 42Decreasing order of bond angle is2011Hybridisation and VSEPR Theory
  43. 43The number of - and -bonds present in pent-4-ene-1-yne is2011Covalent and Co-ordinate Bonding
  44. 44Assertion : is more soluble in than in water. Reason : Ammonia is more polar than water.2011Polarization
  45. 45Assertion : The formal oxidation no. of sulphur in is 2.5 . Reason : Two S-atoms are not directly linked with -atoms.2011Covalent and Co-ordinate Bonding
  46. 46The shape and hybridisation of some xenon oxyfluorides are given. Choose the wrong set.2010Hybridisation and VSEPR Theory
  47. 47The molecules having the same hybridization, shape and number of lone pairs of electrons are2009Hybridisation and VSEPR Theory
  48. 48In solvents like DMSO, acetonitrile, ion of dissolved is more reactive than in methyl alcohol becasue2009Polarization
  49. 49The bond angles in (where is halogen) is in the order2009Hybridisation and VSEPR Theory
  50. 50The correct order of dipole moment is2008Dipole moment

Frequently Asked Questions

1.How many questions are available for Chemical Bonding and Molecular Structure?

This chapter includes 87 questions compiled from AIIMS papers spanning 2001 to 2019.

2.Are these questions only from AIIMS, or from other exams too?

These are AIIMS questions specifically for the Chemical Bonding and Molecular Structure chapter. Questions from other exams like NEET or JIPMER are organised separately under their respective exam sections.

3.Is Chemical Bonding and Molecular Structure an important chapter for AIIMS Chemistry?

Chemical Bonding and Molecular Structure has appeared in 19 of the 19 years of AIIMS papers covered here, with 87 questions across 21 papers - about 4 per paper it appears in.

4.What is the difficulty level of Chemical Bonding and Molecular Structure questions in AIIMS?

Of the 87 questions analysed for this chapter, 64% are easy, 30% moderate and 6% tough. 2001 had the most, with 11 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:

  • Hybridisation and VSEPR Theory - 30 questions (34%)
  • Molecular Orbital Theory - 22 questions (25%)
  • Van Der Waals Forces, Hydrogen Bonding and Metallic Bonding - 9 questions (10%)
  • Molecular Orbital Theory has produced the most tough questions (3).
6.Is Chemical Bonding and Molecular Structure's weightage in AIIMS going up or down?

Across all 21 papers analysed, Chemical Bonding and Molecular Structure has averaged about 4.1 questions per paper. In the last three years (2017–2019), that average has stayed about the same, at about 4.6 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.