Chemical Bonding

Chemical Bonding MDCAT MCQs with answers

66 past paper MCQs from Chemistry unit 10, Chemical Bonding, across 7 topics. They are arranged topic by topic; bigger topics show a sample here and link to their full set and to study notes. Tap “Show answer” for the correct option and a short solution.

Practise as a quiz

VSEPR Theory

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.

All 5 VSEPR Theory MCQs → VSEPR Theory notes →

Hybridization

4.In which of the following functional groups is the carbon atom $sp$ hybridized? (MDCAT 2022)

  1. $-\mathrm{CHO}$
  2. $-\mathrm{COOH}$
  3. $-\mathrm{CN}$
  4. $-\mathrm{COOR}$
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Correct answer: (c) $-\mathrm{CN}$

The carbon of the nitrile group holds a triple bond, so it is $sp$ hybridized and linear.

5.Correct arrangement of orbital according to size of hybridized orbitals? (UHS MDCAT 2025)

  1. sp>sp2>sp3
  2. sp3> sp> sp2
  3. sp2>sp>sp3
  4. sp3>sp2>sp
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Correct answer: (d) sp3>sp2>sp

More s character pulls the orbital in, so the sp orbital is the smallest and sp3 the largest.

6.In ethene molecule, each carbon atom has three hybridized sp2 orbitals which are: (KMU MDCAT 2025)

  1. Coplanar
  2. Tetrahedral
  3. Linear
  4. Pyramidal
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Correct answer: (a) Coplanar

Three sp2 orbitals lie in one plane at $120^{\circ}$ to each other.

All 14 Hybridization MCQs → Hybridization notes →

Sigma and Pi Bonds

7.In propene pi-bond is formed by sideway overlap of: (UHS MDCAT 2025)

  1. s-orbitals
  2. p-orbitals
  3. sp2 hybrid orbitals
  4. sp3 hybrid orbitals
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Correct answer: (b) p-orbitals

A pi bond is the sideways overlap of two unhybridized p orbitals.

8.The theories which explain the formation of sigma and pi bond are EXCEPT: (UHS MDCAT 2025)

  1. MOT
  2. VBT
  3. VSEPR
  4. CFT
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Correct answer: (c) VSEPR

VSEPR predicts shape from electron pair repulsion; it says nothing about how a bond is formed.

9.Bond order is equal to: (NUMS MDCAT 2025)

  1. Difference between number of bonding electrons and antibonding electrons
  2. The sum of number of bonding electrons and antibonding electrons
  3. Half of the difference between number of bonding electrons and antibonding electrons
  4. Quarter of the difference between number of bonding electrons and antibonding electrons
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Correct answer: (c) Half of the difference between number of bonding electrons and antibonding electrons

Bond order is half the difference between the bonding and the antibonding electrons.

All 12 Sigma and Pi Bonds MCQs → Sigma and Pi Bonds notes →

Applications of VSEPR Theory

10.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.

11.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.

12.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.

All 11 Applications of VSEPR Theory MCQs → Applications of VSEPR Theory notes →

Bond Energy

13.Which of the following halogen molecules has the maximum bond energy? (MDCAT 2020)

  1. $\mathrm{F_2}$
  2. $\mathrm{Cl_2}$
  3. $\mathrm{Br_2}$
  4. $\mathrm{I_2}$
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Correct answer: (b) $\mathrm{Cl_2}$

Chlorine is the strongest of the halogen bonds; in $\mathrm{F_2}$ the two small atoms' lone pairs repel and weaken it.

14.What is the reason for energy changes in chemical reactions? (MDCAT 2023)

  1. ionic bonds
  2. bond breakage only
  3. bond formation and breakage
  4. hydrogen bonding
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Correct answer: (c) bond formation and breakage

Breaking bonds absorbs energy and forming them releases it, and the balance of the two is the enthalpy change.

15.The bond energy of hydrogen in the $\mathrm{H_2}$ molecule is: (MDCAT 2023)

  1. $242\ \mathrm{kJ\,mol^{-1}}$
  2. $431\ \mathrm{kJ\,mol^{-1}}$
  3. $436\ \mathrm{kJ\,mol^{-1}}$
  4. $346\ \mathrm{kJ\,mol^{-1}}$
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Correct answer: (c) $436\ \mathrm{kJ\,mol^{-1}}$

It takes $436\ \mathrm{kJ\,mol^{-1}}$ to break the H-H bond.

All 15 Bond Energy MCQs → Bond Energy notes →

Dipole Moment

16.Which of the following molecule has non-polar covalent bond? (NUMS MDCAT 2025)

  1. Methyl chloride
  2. Methanol
  3. Carbon dioxide
  4. Tetrachloromethane
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Correct answer: (c) Carbon dioxide

Carbon dioxide is linear, so its two bond dipoles are equal and opposite and the molecule has no net dipole.

17.Which one of the following molecules has a zero-dipole moment? (KMU MDCAT 2024)

  1. BF3
  2. NF3
  3. NH3
  4. H2O
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Correct answer: (a) BF3

Boron trifluoride is trigonal planar, so its three bond dipoles cancel exactly.

18.Which type of bond is present between C and O in methanol? (PMC MDCAT 2022)

  1. Dative bond
  2. Polar bond
  3. Non-Polar bond
  4. Ionic bond
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Correct answer: (b) Polar bond

Oxygen is much the more electronegative, so the shared pair is drawn towards it.

All 8 Dipole Moment MCQs → Dipole Moment notes →

Applications of Dipole Moment

19.Value of electronegativity of atoms A and B are 1.20 and 4.0 respectively, the percent ionic character will be: (SIBA MDCAT 2025)

  1. 43%
  2. 50%
  3. 55%
  4. 73%
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Correct answer: (d) 73%

An electronegativity difference of $2.8$ puts the bond at about $73\%$ ionic character.

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