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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: 82

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

  1. The bond order of a molecule with a double bond is:
    A. 1
    B. 2
    C. 3
    D. 4

Answer: B. 2

Explanation: A double bond consists of one sigma bond and one pi bond, which gives it a bond order of 2.

  1. In a triple bond, there are:
    A. 3 sigma bonds
    B. 1 sigma bond and 2 pi bonds
    C. 2 sigma bonds and 1 pi bond
    D. 3 pi bonds

Answer: B. 1 sigma bond and 2 pi bonds

Explanation: A triple bond consists of one sigma bond formed by head-on overlap and two pi bonds formed by side-on overlap of p-orbitals.

  1. Which of the following molecules has sp³d hybridization?
    A. BeCl₂
    B. SF₄
    C. H₂O
    D. CO₂

Answer: B. SF₄

Explanation: In sulfur tetrafluoride (SF₄), sulfur undergoes sp³d hybridization, which leads to a seesaw-shaped molecular geometry.

  1. Which of the following is a linear molecule?
    A. H₂O
    B. NH₃
    C. CO₂
    D. CH₄

Answer: C. CO₂

Explanation: In carbon dioxide (CO₂), the central carbon atom is sp hybridized, leading to a linear structure with a bond angle of 180°.

  1. The bond angles in BF₃ are:
    A. 90°
    B. 109.5°
    C. 120°
    D. 180°

Answer: C. 120°

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

  1. In Valence Bond Theory, a sigma bond is formed due to:
    A. Sideways overlap of p-orbitals
    B. End-to-end overlap of atomic orbitals
    C. Overlap of hybrid orbitals only
    D. Overlap of d-orbitals

Answer: B. End-to-end overlap of atomic orbitals

Explanation: A sigma bond is formed by the head-on (end-to-end) overlap of atomic orbitals, which can be s-s, s-p, or p-p overlaps.

  1. In XeF₄, xenon is:
    A. sp³ hybridized
    B. sp² hybridized
    C. sp³d² hybridized
    D. sp³d hybridized

Answer: C. sp³d² hybridized

Explanation: In xenon tetrafluoride (XeF₄), xenon undergoes sp³d² hybridization, resulting in a square planar structure.

  1. The shape of BeCl₂ is:
    A. Linear
    B. Trigonal planar
    C. Tetrahedral
    D. Bent

Answer: A. Linear

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

  1. In the ammonium ion (NH₄⁺), the nitrogen atom is:
    A. sp² hybridized
    B. sp³ hybridized
    C. sp hybridized
    D. Not hybridized

Answer: B. sp³ hybridized

Explanation: In the ammonium ion (NH₄⁺), nitrogen is sp³ hybridized, giving the ion a tetrahedral geometry.

  1. Which of the following molecules has a trigonal planar geometry?
    A. NH₃
    B. H₂O
    C. BF₃
    D. CH₄

Answer: C. BF₃

Explanation: In boron trifluoride (BF₃), boron is sp² hybridized, which gives the molecule a trigonal planar geometry with bond angles of 120°.

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