Questions on VSEPR Theory

Questions on VSEPR Theory

 Multiple-Choice Questions: VSEPR Theory

    1. What is the main concept behind VSEPR theory?

A) Atoms are spheres of influence

B) Electrons are shared in lattice structures

C) Electron pairs around a central atom repel each other

D) Bonding occurs in symmetrical patterns

E) Protons determine molecular geometry

    2. VSEPR theory is primarily used to predict:

A) Electron configurations

B) Electronegativity trends

C) Molecular geometry

D) Bond strength

E) Atomic number

    3. According to VSEPR theory, the shape of a molecule is determined by:

A) The number of atoms only

B) The atomic radius

C) The number of lone and bonding electron pairs

D) The mass number of atoms

E) The size of the nucleus

    4. What is the predicted shape of a molecule with two bonding pairs and no lone pairs on the central atom?

A) Trigonal planar

B) Bent

C) Linear

D) Tetrahedral

E) Trigonal bipyramidal

    5. Which of the following molecules has a trigonal planar geometry?

A) CH₄

B) H₂O

C) BF₃

D) NH₃

E) CO₂

    6. How many bonding regions and lone pairs are on the central atom of water (H₂O)?

A) 2 bonding, 1 lone pair

B) 3 bonding, 1 lone pair

C) 2 bonding, 2 lone pairs

D) 4 bonding, 0 lone pairs

E) 3 bonding, 2 lone pairs

    7. Which molecular shape is associated with four regions of electron density and no lone pairs on the central atom?

A) Bent

B) Trigonal planar

C) Tetrahedral

D) Trigonal pyramidal

E) Octahedral

    8. The molecular geometry of NH₃ is best described as:

A) Tetrahedral

B) Bent

C) Trigonal planar

D) Trigonal pyramidal

E) Linear

    9. In the VSEPR model, lone pairs:

A) Do not affect shape

B) Repel less strongly than bonding pairs

C) Repel more strongly than bonding pairs

D) Only exist in diatomic molecules

E) Always form hydrogen bonds

    10. What is the electron pair geometry of carbon dioxide (CO₂)?

A) Bent

B) Trigonal planar

C) Linear

D) Tetrahedral

E) Trigonal pyramidal

    11. What shape is predicted for a molecule with five bonding domains and no lone pairs?

A) Tetrahedral

B) Octahedral

C) Linear

D) Trigonal bipyramidal

E) Square planar

    12. A molecule with 6 electron groups and one lone pair will have what molecular geometry?

A) Octahedral

B) Square pyramidal

C) Square planar

D) Tetrahedral

E) Trigonal planar

    13. Which of the following is an example of a molecule with a linear shape?

A) H₂O

B) NH₃

C) BeCl₂

D) CH₄

E) BF₃

    14. How many lone pairs are on the central atom of SF₄?

A) 0

B) 1

C) 2

D) 3

E) 4

    15. What is the molecular geometry of SF₄?

A) Trigonal planar

B) Trigonal pyramidal

C) See-saw

D) Tetrahedral

E) Square planar

    16. Which molecule has a bent molecular shape due to lone pairs?

A) CO₂

B) NH₃

C) CH₄

D) H₂O

E) BF₃

    17. The bond angle in a tetrahedral molecule is approximately:

A) 90°

B) 109.5°

C) 120°

D) 180°

E) 105°

    18. A molecule with three bonding pairs and one lone pair will have what shape?

A) Trigonal planar

B) Trigonal pyramidal

C) Bent

D) Tetrahedral

E) Linear

    19. Which factor is not considered in VSEPR theory?

A) Lone pairs

B) Bonding pairs

C) Electron repulsion

D) Bond energies

E) Electron domains

    20. Which geometry results when a central atom has six bonding pairs and no lone pairs?

A) Tetrahedral

B) Square planar

C) Octahedral

D) Trigonal bipyramidal

E) See-saw

Questions on VSEPR Theory

 Answers with Explanations

    1. C) VSEPR is based on repulsion between electron pairs around a central atom.

    2. C) VSEPR is used to predict the 3D shape (geometry) of molecules.

    3. C) Molecular shape is determined by lone and bonding electron pairs.

    4. C) Two bonding pairs and no lone pairs give a linear shape.

    5. C) BF₃ has a trigonal planar geometry.

    6. C) H₂O has 2 bonding pairs and 2 lone pairs.

    7. C) 4 regions of electron density and no lone pairs give a tetrahedral shape.

    8. D) NH₃ has a trigonal pyramidal shape due to one lone pair.

    9. C) Lone pairs repel more strongly than bonding pairs.

    10. C) CO₂ is linear in shape.

    11. D) 5 bonding regions → trigonal bipyramidal.

    12. B) 6 regions, 1 lone pair → square pyramidal.

    13. C) BeCl₂ is a classic linear molecule.

    14. B) SF₄ has 1 lone pair on the central atom.

    15. C) The shape of SF₄ is see-saw.

    16. D) H₂O has bent geometry due to 2 lone pairs.

    17. B) Tetrahedral bond angle is approximately 109.5°.

    18. B) 3 bonding pairs, 1 lone pair → trigonal pyramidal.

    19. D) VSEPR doesn’t consider bond energy, just geometry.

    20. C) 6 bonding pairs, no lone pairs → octahedral.


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Ronaldo Silva: Professor and Specialist in Science Teaching, from UFF/RJ, with more than 25 years of experience in teaching.

 
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