Applications of VSEPR Theory

Applications of VSEPR Theory MDCAT MCQs with answers

11 past paper MCQs on Applications of 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.An $\mathrm{AB_4}$ type molecule with no lone pairs has which shape? (MDCAT 2022)

  1. trigonal
  2. regular tetrahedron
  3. regular octahedron
  4. regular pyramid
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Correct answer: (b) regular tetrahedron

Four bond pairs and nothing else repel to the corners of a tetrahedron, $109.5^\circ$ apart.

2.Molecules having one lone pair and three bond pairs have geometrical shape (UHS MDCAT 2025)

  1. Bent or angular
  2. Trigonal
  3. Trigonal pyramidal
  4. Trigonal planer
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Correct answer: (c) Trigonal pyramidal

Four electron pairs are arranged tetrahedrally, and with one of them a lone pair the shape of the molecule is trigonal pyramidal.

3.Which one of the following is a planar molecule? (KMU MDCAT 2025)

  1. NH3
  2. H2O
  3. BF3
  4. CH4
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Correct answer: (c) BF3

Three bond pairs and no lone pair on boron give a flat trigonal planar molecule.

4.Which of the following molecules have similar molecular shape? (SIBA MDCAT 2025)

  1. NH3 & AlCl3
  2. BCl3 & NH3
  3. AlCl3 & PCl3
  4. H2O & SnCl2
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Correct answer: (d) H2O & SnCl2

Both have two bond pairs and lone pairs on the central atom, so both are bent.

5.All of following have two bond pairs and show linear geometry except: (SIBA MDCAT 2025)

  1. SnCl2
  2. CS2
  3. HCN
  4. CO2
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Correct answer: (a) SnCl2

Tin in tin(II) chloride keeps a lone pair, which bends the molecule.

6.Q.95 AB4 Type with no Lone Pairs geometry enables to form which shape of molecule? (UHS MDCAT 2023)

  1. Trigonal
  2. Regular tetrahedron
  3. Regular octahedron
  4. Regular pyramidal
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Correct answer: (b) Regular tetrahedron

Four bond pairs and no lone pair repel into a regular tetrahedron.

7.Select among the following that has trigonal pyramidal geometry: (PMC MDCAT 2022)

  1. NH3
  2. BF3
  3. AlCl3
  4. SO3
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Correct answer: (a) NH3

Ammonia has three bond pairs and one lone pair, so its shape is trigonal pyramidal.

8.If a molecule contains 4 electron pairs, The shape of molecule will be: (PMC Practice 2021)

  1. Tetrahedral
  2. Trigonal
  3. Linear
  4. None of these
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Correct answer: (a) Tetrahedral

Four electron pairs repel into a tetrahedron.

9.Which of the following set constitutes of all the molecules and ions of non-planar geometry? (UHS MDCAT 2019)

  1. PH4+, NH3, SO3, Benzene
  2. CH4, NH4 +, MnO4- , NF3
  3. Ethene, H2O, BeCl2, H2S
  4. SO2, C2H4, BF3, NO3-
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Correct answer: (b) CH4, NH4 +, MnO4- , NF3

Methane, the ammonium ion, the permanganate ion and nitrogen trifluoride are all three dimensional.

10.Which option shows all the molecules with bond angle 109.5 degrees. (UHS MDCAT 2018)

  1. CH4, NH4+ , PH3
  2. SiCl4, H2O , BeCl2
  3. SiCl4, NH4+ , CH4
  4. CH4, CCl4, NH3
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Correct answer: (c) SiCl4, NH4+ , CH4

All three have four bond pairs and no lone pair, so all are regular tetrahedra.

11.What is the exact value of angle in BF3: (UHS MDCAT 2017)

  1. 90˚
  2. 119.5˚
  3. 104.5˚
  4. 120˚
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Correct answer: (d) 120˚

Three bond pairs and no lone pair give a trigonal planar molecule with $120^{\circ}$ angles.

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