Valence Bond Theory MCQs

21. According to Valence Bond Theory, which of the following statements is true?

• A) All bonds are formed by the sharing of electrons
• B) Covalent bonds are formed by the overlap of orbitals
• C) Bond formation decreases the stability of atoms
• D) Only pi bonds are formed by the overlap of orbitals
• Answer: B

22. In Valence Bond Theory, resonance is explained as:

• A) Shifting of electrons between two atoms
• B) Delocalization of electrons in a molecule
• C) Formation of sigma bonds
• D) A defect in hybridization
• Answer: B

23. Which of the following molecules has delocalized pi electrons?

• A) Ethene
• B) Benzene
• C) Ethane
• D) Methane
• Answer: B

24. Valence Bond Theory primarily considers which type of orbitals for bonding?

• A) Atomic orbitals
• B) Molecular orbitals
• C) Crystal orbitals
• D) Hybrid orbitals
• Answer: A

25. Which of the following explains the directional properties of covalent bonds?

• A) Bond energy
• B) Hybridization
• C) Bond length
• D) Bond dissociation
• Answer: B

26. In the molecule H₂O, the bond angle is approximately:

• A) 180°
• B) 120°
• C) 109.5°
• D) 104.5°
• Answer: D

27. Which of the following molecules is an example of sp³ hybridization?

• A) NH₃
• B) CO₂
• C) NO₂
• D) BF₃
• Answer: A

28. Valence Bond Theory can explain the:

• A) Magnetism of molecules
• B) Color of compounds
• C) Shapes and bond angles in molecules
• D) Solubility of compounds
• Answer: C

29. The hybridization of carbon atoms in ethane (C₂H₆) is:

• A) sp
• B) sp²
• C) sp³
• D) sp³d
• Answer: C

30. In which of the following is the bond angle closest to 120°?

• A) BF₃
• B) NH₃
• C) H₂O
• D) CH₄
• Answer: A