A LevelChemistryCambridge (CIE)Exam Questions3. Chemical BondingCovalent Bonding & Coordinate (Dative Covalent) Bonding

Covalent Bonding & Coordinate (Dative Covalent) Bonding (Cambridge (CIE) A Level Chemistry): Exam Questions

Exam code: 9701

58 mins19 questions

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Covalent Bonding & Coordinate (Dative Covalent) Bonding

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1
1 mark

Phosphine, PH3, can react with a hydrogen ion, H+, to form the phosphonium ion.

Which type of bond is formed in this reaction?

  • co-ordinate (dative covalent) bond

  • dipole-dipole forces

  • hydrogen bond

  • ionic bond

Choose your answer

2
1 mark

Which species contains a co-ordinate (dative covalent) bond?

  • CN–

  • N2

  • NH3

  • NH4+

Choose your answer

3
1 mark

Which bond is formed by the end-on overlap of atomic orbitals?

  • ionic bond

  • metallic bond

  • pi (π) bond

  • sigma (σ) bond

Choose your answer

1
1 mark

Which feature is not present in a nitrogen molecule, N2?

  • one σ bond

  • three π bonds

  • three shared pairs of electrons

  • two lone pairs of electrons

Choose your answer

2
1 mark

Which diagrams correctly illustrate the formation of a σ bond and a π bond from the overlap of atomic orbitals?

Table of diagrams comparing σ and π molecular orbital overlaps for A–D, showing combinations of s and p orbitals with bonding and antibonding shapes.

    Choose your answer

    3
    1 mark

    “The bond X between the hydrogen and halogen atoms in HBr is Y than in HI.”

    Which row does not correctly complete the sentence?

    X

    Y

    A

    length

    shorter

    B

    energy

    greater

    C

    angle

    smaller

    D

    polarity

    greater

      Choose your answer

      4
      1 mark

      The bond length in an O2 molecule is 0.121 nm and the bond length in an N2 molecule is 0.109 nm.

      Which statement explains why the bond in N2 is shorter than the bond in O2?

      • Nitrogen has a smaller atomic radius.

      • Oxygen atoms are more electronegative.

      • Oxygen bond is stronger.

      • The bond in an N2 molecule contains more shared electrons.

      Choose your answer

      5
      1 mark

      Which bond is the most polar?

      • C–N

      • N–O

      • P–S

      • Si–Cl

      Choose your answer

      6
      1 mark

      Which compound has the highest boiling point?

      • CH3CH2CH2CH3

      • (CH3)3CH

      • CH3CH2CH2OH

      • CH3CH2CHO

      Choose your answer

      7
      1 mark

      How many σ (sigma) and π (pi) bonds are present in a molecule of ethanenitrile (CH3CN)?

      • 4σ, 1π

      • 5σ, 1π

      • 5σ, 2π

      • 6σ, 2π

      Choose your answer

      8
      1 mark

      How many σ (sigma) and π (pi) bonds are present in one molecule of acrylonitrile (propenenitrile, CH2=CHCN)?

      number of σ bonds

      number of π bonds

      A

      4

      2

      B

      6

      1

      C

      6

      3

      D

      7

      3

        Choose your answer

        1
        1 mark

        Which bond is the shortest?

        • the carbon-carbon bond in ethyne, C2H2

        • the nitrogen-nitrogen bond in nitrogen, N2

        • the oxygen-oxygen bond in oxygen, O2

        • the oxygen-oxygen bond in ozone, O3

        Choose your answer

        2
        1 mark

        Which statement describes the bonding within a carbonate ion, CO32–?

        • electrostatic attraction between separate carbonate ions

        • electrostatic attraction between shared pairs of electrons and positively charged nuclei

        • instantaneous dipole-induced dipole forces

        • permanent dipole–permanent dipole forces

        Choose your answer

        3
        1 mark

        The structure of the NO2 molecule is shown below.

        Skeletal formula of the NO2- ion, showing a central nitrogen double-bonded to one oxygen and single-bonded to another negatively charged oxygen

        In which compound is the hybridisation of the carbon atoms the same as that of the nitrogen atom in NO2?

        • ethene

        • ethyne

        • methane

        • propane

        Choose your answer