Dipole Moment

Dipole Moment MDCAT MCQs with answers

8 past paper MCQs on Dipole Moment, 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.

Read the notes first Practise the unit as a quiz

1.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.

2.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.

3.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.

4.Which of the following molecule is covalent in nature? (NUMS MDCAT 2022)

  1. NaCl
  2. MgCl2
  3. AlCl3
  4. KCl
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Correct answer: (c) AlCl3

Aluminium has a small, highly charged ion that polarizes the chloride, so the bond is largely covalent.

5.Which of the following molecule is polar? (NUMS MDCAT 2022)

  1. CCl4
  2. AlCl3
  3. CO2
  4. HCl
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Correct answer: (d) HCl

Hydrogen chloride is a single polar bond with nothing to cancel it; the other three are symmetrical.

6.The difference in the E.N values of the bonded atoms b/w two atoms is an index to of covalent bond: (PMC Practice 2021)

  1. Polar nature
  2. Non-polar nature
  3. Strength
  4. Nature
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Correct answer: (a) Polar nature

The greater the difference in electronegativity, the more polar the bond.

7.The molecules of ________ have dipole-dipole interaction. (PMC Practice 2021)

  1. Methane
  2. Neon
  3. Ammonia
  4. Ethane-ethyl alcohol
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Correct answer: (c) Ammonia

Ammonia is polar; methane and ethane are not, and neon is a single atom.

8.Non-polar covalent bond is formed between: (PMC Practice 2021)

  1. Homonuclear diatomic molecules
  2. Heteronuclear diatomic molecules
  3. Similar atoms
  4. Dissimilar atoms
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Correct answer: (a) Homonuclear diatomic molecules

Two like atoms pull equally on the shared pair, so the bond has no polarity.

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