VSEPR Theory

VSEPR Theory MDCAT MCQs with answers

5 past paper MCQs on VSEPR Theory, from the Chemical Bonding unit of MDCAT Chemistry. The year each question appeared is shown where known; tap “Show answer” for the correct option and a short solution.

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1.Which of the following is NOT a feature of the Valence Shell Electron Pair Repulsion theory? (MDCAT 2024)

  1. it determines the shape of a molecule
  2. pairs of electrons repel each other
  3. it helps in understanding the interaction of medicinal drug molecules
  4. only lone pairs participate in determining the geometry of molecules
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Correct answer: (d) only lone pairs participate in determining the geometry of molecules

Bond pairs count as well as lone pairs; it is the whole set of electron pairs that fixes the shape.

2.Which of the following is NOT a feature of Valence Shell Electron Pair Repulsion theory? (UHS MDCAT 2024)

  1. It determines the shape of molecule
  2. Pairs of electrons repel each other
  3. It helps in understanding interaction of medicinal drug molecules
  4. Only lone pairs participate in determining geometry of molecules
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Correct answer: (d) Only lone pairs participate in determining geometry of molecules

VSEPR counts lone pairs and bond pairs alike; the lone pairs merely repel more strongly.

3.Total number of electron pairs present in the valence shell of central atom in water are (KMU MDCAT 2024)

  1. 2
  2. 3
  3. 4
  4. 5
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Correct answer: (c) 4

Oxygen in water has two bond pairs and two lone pairs, four pairs in all.

4.Valance shell electron pair repulsion theory explains: (NUMS MDCAT 2023)

  1. Bond Energy
  2. Bond Length
  3. Shapes and Bond Energy
  4. Shapes
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Correct answer: (d) Shapes

VSEPR predicts the shape of a molecule from the repulsion of its electron pairs.

5.Which of the following does not have a complete octet? (PMC MDCAT 2022)

  1. O2-
  2. N5+
  3. Ca2+
  4. K+
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Correct answer: (b) N5+

Nitrogen stripped of five electrons is left with only two, so it has no octet.

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