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Home/ Chemistry/“Valence Bond Theory” MCQ with Answer Explanation : NEET 2025.

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On: October 5, 2024 Posted in Chemistry, Education, Exam, NEET Comments: 0 Views: 83

“Valence Bond Theory” MCQ with Answer Explanation : NEET 2025.

  1. The angle between sp³ hybrid orbitals is:
    A. 90°
    B. 109.5°
    C. 120°
    D. 180°

Answer: B. 109.5°

Explanation: The sp³ hybrid orbitals are arranged in a tetrahedral geometry, and the angle between the orbitals is 109.5°.

  1. Which molecule has both sigma and pi bonds?
    A. CH₄
    B. CO₂
    C. NH₃
    D. H₂O

Answer: B. CO₂

Explanation: In carbon dioxide (CO₂), each carbon-oxygen bond consists of one sigma bond and one pi bond, making it a double bond.

  1. Hybridization in SF₆ can be described as:
    A. sp³
    B. sp²
    C. sp³d²
    D. sp³d

Answer: C. sp³d²

Explanation: In sulfur hexafluoride (SF₆), sulfur undergoes sp³d² hybridization, leading to an octahedral structure with bond angles of 90°.

  1. Which molecule is an example of sp³ hybridization?
    A. CO₂
    B. CH₄
    C. C₂H₂
    D. BeCl₂

Answer: B. CH₄

Explanation: In methane (CH₄), carbon undergoes sp³ hybridization, resulting in a tetrahedral structure with bond angles of 109.5°.

  1. Which of the following is linear due to sp hybridization?
    A. CH₄
    B. BeCl₂
    C. BF₃
    D. H₂O

Answer: B. BeCl₂

Explanation: In beryllium chloride (BeCl₂), beryllium is sp hybridized, leading to a linear structure with bond angles of 180°.

  1. Which of the following molecules involves sp² hybridization?
    A. C₂H₂
    B. CH₄
    C. BF₃
    D. NH₃

Answer: C. BF₃

Explanation: In boron trifluoride (BF₃), boron is sp² hybridized, leading to a trigonal planar structure with bond angles of 120°.

  1. The bond angle in CH₄ is:
    A. 90°
    B. 109.5°
    C. 120°
    D. 180°

Answer: B. 109.5°

Explanation: In methane (CH₄), carbon is sp³ hybridized, resulting in a tetrahedral structure with bond angles of 109.5°.

  1. In VBT, a pi bond is formed by:
    A. End-to-end overlap of orbitals
    B. Sideways overlap of p-orbitals
    C. Overlap of s-orbitals
    D. Hybrid orbital overlap

Answer: B. Sideways overlap of p-orbitals

Explanation: Pi bonds result from the sideways overlap of p-orbitals, whereas sigma bonds are formed by end-to-end overlap.

  1. Which of the following has no pi bonds?
    A. CO₂
    B. C₂H₄
    C. CH₄
    D. C₂H₂

Answer: C. CH₄

Explanation: Methane (CH₄) contains only sigma bonds, as all carbon-hydrogen bonds are formed by the overlap of sp³ hybrid orbitals.

  1. In VBT, the term resonance refers to:
    A. The mixing of orbitals to form hybrid orbitals
    B. The existence of multiple bond structures for a molecule
    C. The formation of pi bonds
    D. The delocalization of electrons in molecular orbitals

Answer: B. The existence of multiple bond structures for a molecule

Explanation: Resonance occurs when a molecule can be represented by two or more valid Lewis structures, with the actual structure being a hybrid of these forms.

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