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MHT-CET Chemical Bonding and Molecular Structure — practice questions — page 4

Explore 100 free Chemical Bonding and Molecular Structure questions in MHT-CET Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Chemical Bonding and Molecular Structure questions and exercises with answers

Showing questions 91–100 of 100.

NF3 has a much smaller dipole moment than NH3 becauseRead the answer and worked solution →The partial covalent character of ionic bonds was explained byRead the answer and worked solution →Which lithium halide has the greatest covalent character?Read the answer and worked solution →Of two cations of equal size and charge, which polarises anions more?Read the answer and worked solution →Which order of VSEPR repulsions is correct?Read the answer and worked solution →Why do lone pairs repel more than bond pairs?Read the answer and worked solution →Five electron pairs with no lone pair give which geometry?Read the answer and worked solution →What is the shape of the PCl5 molecule?Read the answer and worked solution →SF6 has what molecular geometry?Read the answer and worked solution →What is the angle between sp3 hybrid orbitals?Read the answer and worked solution →

Worked practice questions

NF3 has a much smaller dipole moment than NH3 because

  1. NF3 has a planar geometry overall
  2. N–F bonds have no polarity at all
  3. fluorine has a lower atomic number
  4. lone pair dipole opposes bond dipoles
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Correct answer: D. lone pair dipole opposes bond dipoles

In NF3 the lone pair dipole points against the N–F bond dipoles and cancels part of them, unlike in NH3.

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The partial covalent character of ionic bonds was explained by

  1. Fajans
  2. Debye
  3. Pauling
  4. Kossel
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Correct answer: A. Fajans

Fajans described how a cation polarises an anion, giving ionic bonds some covalent character.

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Which lithium halide has the greatest covalent character?

  1. LiF
  2. LiI
  3. LiCl
  4. LiBr
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Correct answer: B. LiI

The large, easily distorted iodide ion is polarised most by the small Li+ ion, so LiI is the most covalent.

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