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Chemical Bonding and Molecular Structure · I PU Chemistry

Name: ____________________
Date: ____________________
Mode: BalancedQuestions: 20Difficulty: MixedCheck code: 11892069

1. What is the formal charge on nitrogen in NH₄⁺?

  1. −1
  2. +2
  3. +1
  4. 0

2. Which species is an odd-electron molecule?

  1. NO
  2. CO₂
  3. N₂
  4. CH₄

3. Which carbon–carbon bond is shortest?

  1. C≡C
  2. C=C
  3. C–C
  4. All have equal length

4. Why is CO₂ non-polar although each C=O bond is polar?

  1. Carbon and oxygen have equal electronegativity
  2. It contains no shared electron pairs
  3. Each C=O bond has zero dipole moment
  4. Its equal bond dipoles cancel in a linear molecule

5. Which compound is expected to have the larger lattice-enthalpy magnitude?

  1. KBr
  2. LiF
  3. MgO
  4. NaCl

6. Which compound should show the greatest covalent character?

  1. LiI
  2. LiF
  3. NaF
  4. KF

7. How many valence electrons are present in one CO₂ molecule?

  1. 16
  2. 12
  3. 20
  4. 22

8. Which order of electron-pair repulsion is correct?

  1. LP–LP > LP–BP > BP–BP
  2. BP–BP > LP–BP > LP–LP
  3. LP–BP > LP–LP > BP–BP
  4. All repulsions are equal

9. Which species has equivalent bond lengths because of resonance?

  1. NO₃⁻
  2. H₂O
  3. NH₃
  4. CH₄

10. What is the hybridisation of each carbon atom in ethene, C₂H₄?

  1. sp³d
  2. sp²
  3. sp³
  4. sp

11. What are the electron geometry and molecular shape of NH₃, respectively?

  1. Tetrahedral; trigonal pyramidal
  2. Trigonal planar; trigonal planar
  3. Tetrahedral; bent
  4. Trigonal pyramidal; tetrahedral

12. Why is O₂ paramagnetic according to molecular-orbital theory?

  1. It has a double bond in its Lewis structure
  2. All its electrons are paired
  3. It has zero bond order
  4. It has two unpaired electrons in degenerate π* orbitals

13. Which statement correctly describes resonance contributors of NO₃⁻?

  1. All N–O bonds have permanently different lengths
  2. Only electron placement changes; the atom arrangement stays fixed
  3. The nitrogen atom rapidly moves between three positions
  4. Three separate nitrate species exist in equilibrium

14. Which change generally weakens and lengthens an O₂ bond?

  1. Adding an electron to an antibonding orbital
  2. Removing an electron from an antibonding orbital
  3. Increasing bond order
  4. Pairing core electrons

15. Which cation most strongly polarises the same anion?

  1. K⁺
  2. Al³⁺
  3. Mg²⁺
  4. Na⁺

16. Which overlap forms a pi bond?

  1. Sidewise overlap of parallel p orbitals
  2. Head-on overlap along the internuclear axis
  3. Overlap of two spherical s orbitals only
  4. Overlap that produces cylindrical symmetry about the bond axis

17. Which molecule has an electron-deficient central atom in its usual Lewis structure?

  1. CH₄
  2. NH₃
  3. H₂O
  4. BF₃

18. Why is the boiling point of H₂O much higher than that of H₂S?

  1. H₂S is an ionic substance
  2. Water forms an extensive intermolecular hydrogen-bond network
  3. The O–H covalent bond breaks during boiling
  4. H₂O has the greater molar mass

19. Which pure substance forms strong intermolecular hydrogen bonds?

  1. H₂S
  2. PH₃
  3. CH₃OH
  4. CH₄

20. Which Lewis contributor is generally preferred?

  1. The one with minimal formal-charge separation
  2. The one with the maximum number of formal charges
  3. The one placing negative charge on the less electronegative atom
  4. The one that changes the atomic skeleton
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