[email protected]
Chemistry, Biology
Climate Change
Microbiology
Biomedicine
Virus, Bacteria
Paleontology
Oncology
Scientists Link Disappearance of White Sharks to Declining Fish and Shark Populations
Scientists Develop Self-Propelling Microcleaners That Capture and Remove Microplastics From Water
Discovery of Long-Chain Alkanes on Mars Raises New Questions About Its Past
Breakthrough Experiment Shows Earth’s Rotation Can Generate Power
Global Warming Could Make Breathing Harder by Drying Out Airways
Tropical Forest Diversity Increases Carbon Gains but Not in the Soil
Screen Time Linked to Lower Language Skills in Toddlers
Study Suggests Ancient Seas Hosted Hyper-Apex Predators
Ideal Gas Law Calculator
PV = nRT
Enthalpy Change Calculator
ΔH = ΔU + p × ΔV
ΔH = m × c × ΔT
Gibbs Free Energy Calculator
ΔG and ΔG°
Rydberg Equation Calculator
Find λ using Rydberg formula
Combined Gas Law Calculator
P1V1/T1 = P2V2/T2
Theories of Covalent Bonding and Shapes of Molecules Quiz
Test your understanding of covalent bonding, molecular shapes, and the theories that explain them.
1 / 41
1. Which of the following molecules is nonpolar despite having polar bonds?
Answer: c) CO₂. CO₂ is linear, and the bond dipoles cancel each other out.
2 / 41
2. According to VSEPR theory, what is the molecular geometry of BF₃?
Answer: b) Trigonal planar. Boron has 3 bonding pairs and no lone pairs.
3 / 41
3. Which hybridization is associated with a tetrahedral electron geometry?
Answer: c) sp³. Four hybrid orbitals are required for a tetrahedral arrangement.
4 / 41
4. Which molecule has the shortest bond length?
Answer: b) N₂. Nitrogen has a triple bond, which is shorter than double or single bonds.
5 / 41
5. What is the bond angle in a molecule with a trigonal pyramidal shape?
Answer: d) <109.5°. The lone pair repels the bonding pairs, reducing the bond angle.
6 / 41
6. Which of the following molecules exhibits hydrogen bonding?
Answer: c) HF. Hydrogen bonding occurs when hydrogen is bonded to highly electronegative atoms like F, O, or N.
7 / 41
7. Which theory explains the formation of sigma and pi bonds?
Answer: b) Valence Bond Theory. VB theory describes the overlap of atomic orbitals to form bonds.
8 / 41
8. Which molecule is linear?
Answer: b) BeCl₂. Beryllium has two bonding pairs and no lone pairs.
9 / 41
9. What is the hybridization of the central atom in SF₆?
Answer: c) sp³d². Six hybrid orbitals are needed for an octahedral shape.
10 / 41
10. Which of the following has the highest bond energy?
Answer: c) Triple Bond. Triple bonds involve greater electron density between the atoms, leading to stronger attraction.
11 / 41
11. Which molecule has a dipole moment of zero?
Answer: c) CCl₄. The symmetrical tetrahedral shape causes the bond dipoles to cancel.
12 / 41
12. The concept of resonance is best described by:
Answer: b) Lewis structures. Resonance involves multiple valid Lewis structures for a molecule.
13 / 41
13. Which molecule has a bent shape?
Answer: c) H₂O. Oxygen has two bonding pairs and two lone pairs.
14 / 41
14. What is the bond order of O₂ according to Molecular Orbital Theory?
Answer: b) 2. O₂ has 12 electrons filling bonding and antibonding molecular orbitals.
15 / 41
15. What is the shape of a molecule with sp³d hybridization and one lone pair?
sp³d hybridization means the molecule has 5 regions (bonds or lone pairs) around the central atom. With 1 lone pair, the remaining 4 bonds form a shape like a "see-saw" because the lone pair pushes the bonds into this arrangement.
16 / 41
16. Which of the following is paramagnetic?
Answer: b) O₂. Oxygen has unpaired electrons in its molecular orbitals.
17 / 41
17. Which of the following molecules has the largest bond angle?
Answer: d) BF₃. BF₃ is trigonal planar with 120° bond angles.
18 / 41
18. Which of the following is an exception to the octet rule?
Answer: c) BF₃. Boron only has 6 electrons around it.
19 / 41
19. Which theory explains the delocalization of electrons?
Answer: c) Molecular Orbital Theory. MO theory describes electrons as being spread over the entire molecule.
20 / 41
20. Which molecule has a trigonal bipyramidal shape?
Answer: c) PCl₅. Phosphorus has 5 bonding pairs and no lone pairs.
21 / 41
21. What is the molecular geometry of XeF₄?
Answer: b) Square planar. Xenon has 4 bonding pairs and 2 lone pairs.
22 / 41
22. Which hybridization is associated with a linear electron geometry?
Answer: a) sp. Two hybrid orbitals are required for a linear arrangement.
23 / 41
23. Which of the following molecules does not exhibit hydrogen bonding in its pure liquid state?
Answer: d) HCl. Hydrogen bonding requires hydrogen bonded to F, O, or N.
24 / 41
24. What is the shape of a molecule with sp³d² hybridization and two lone pairs?
Answer: b) Square planar. The lone pairs are trans to each other.
25 / 41
25. Which molecule has the longest bond length among the following?
Answer: d) I₂. Bond length increases down the halogen group.
26 / 41
26. Which molecule has the highest bond order?
Answer: a) O₂. O₂ has a bond order of 2. B2 has a bond order of 1, H2 has a bond order of 1 and He2 has a bond order of 0.
27 / 41
27. What is the hybridization of the central atom in XeF₂?
Answer: b) sp³d. Xenon has 2 bonding pairs and 3 lone pairs.
28 / 41
28. Which molecule has a T-shaped geometry?
Answer: a) BrF₃. Bromine has 3 bonding pairs and 2 lone pairs.
29 / 41
29. Which of the following is an example of a molecule with an expanded octet?
Answer: c) SF₆. Sulfur has 12 electrons around it.
30 / 41
30. The strength of a covalent bond is directly related to:
Answer: b) Bond order. Higher bond order means stronger bonds.
31 / 41
31. Which of the following has the weakest bond?
Answer: c) F-F. Fluorine has a small atomic radius and high electron-electron repulsion.
32 / 41
32. What is the bond order of He₂⁺?
Answer: b) 0.5. There are 3 electrons in bonding and antibonding orbitals so (2-1)/2=0.5
33 / 41
33. Which of these molecules has the largest dipole moment?
Answer: c) CHCl₃. Because of the difference in electronegativity between H and Cl and the asymmetrical shape of the molecule.
34 / 41
34. Which intermolecular force is the strongest?
Ion-Dipole Interactions: Strongest, occur between ions and polar molecules. The full charge of the ion interacts strongly with the partial charges of the dipole, making this the strongest intermolecular force.
35 / 41
35. What is the molecular geometry of a molecule with sp³d hybridization and two lone pairs?
Answer: a) T-shaped. The lone pairs occupy equatorial positions, resulting in a T-shape.
36 / 41
36. Which molecule has the weakest bond?
Answer: c) F₂. Due to small size and high electron-electron repulsion.
37 / 41
37. Which of the following species has the highest bond order?
Answer: a) O₂⁺. O₂⁺ has a bond order of 2.5, O₂ has 2, O₂⁻ has 1.5, and O₂²⁻ has 1.
38 / 41
38. Which of the following is an example of a molecule that violates the octet rule by having fewer than eight electrons around the central atom?
Answer: c) BeCl₂. Beryllium has only four electrons around it.
39 / 41
39. Bond enthalpy is a measure of:
Answer: b) Bond strength. It is the energy required to break a bond.
40 / 41
40. Which intermolecular force is present in all molecules?
Answer: c) London Dispersion Forces. These forces arise from temporary fluctuations in electron distribution.
41 / 41
41. Which of the following is a correct representation of resonance?
Your score is
The average score is 0%
Restart quiz
Please rate this quiz. Your feedback helps us make it better.
Thank you for your feedback.
Topics included in this quiz are:
Molecular Orbital Theory Quiz – Practice with MCQs
VSEPR Theory Quiz – Practice with Interactive MCQs
Functional Groups Quiz | Organic Chemistry
Atomic and Ionic Radii Quiz | AS Chemistry
Subatomic Particles Quiz | A Level Chemistry
Paper Chromatography and Rf Value Quiz
Solubility Quiz | Chemistry
Chemical Equilibrium | Chemistry Quiz (21 Questions)
Properties of Solids | Chemistry Quiz
Quiz: Properties of Liquids and Water
You must be logged in to post a comment.
