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

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

Exam code: 9701

57 mins18 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?

  • Dipole-dipole forces

  • Dative covalent bond

  • Ionic bond

  • Hydrogen bond

Choose your answer

2
1 mark

Which of the following contains a dative covalent bond?

  • N2

  • NH3

  • CN-

  • NH4+

Choose your answer

3
1 mark

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

  • Sigma bond

  • Pi bond

  • Ionic bond

  • Metallic bond

Choose your answer

1
1 mark

N2 is a covalently bonded molecule that makes up 78% of gas in the air we breathe.

Which of the following is not present in an N2 molecule?

  • Two lone pairs of electrons

  • Three shared pairs of electrons

  • Three π bonds

  • 180° bond angle

Choose your answer

2
1 mark

“The bond ....X…. between the hydrogen and halide in HBr is ….Y…. than in Hl.”

Which pair of words does not correctly complete the sentence above.

 

X 

Y

A

Length

Shorter

B

Energy

Greater

C

Angle

Smaller

D

Polarity

Greater

    Choose your answer

    3
    1 mark

    Oxygen and nitrogen are consecutive elements in Period 2 and both form diatomic molecules.

    The bond length in the O2 bond is 1.21 A and the bond length in N2 is 1.09A. 

    What best explains the difference in bond length?

    • Oxygen atoms are more electronegative.

    • Nitrogen has more bonding electrons.

    • Nitrogen has a smaller atomic radius.

    • Oxygen bond is stronger.

    Choose your answer

    4
    1 mark

    Which pair of elements will form the most polar covalent bond?

    • C and N

    • Si and Cl

    • P and S

    • N and O

    Choose your answer

    5
    1 mark

    Which compound has the highest boiling point?

    • CH3CH2CH2CH3

    • (CH3)3CH

    • CH3CH2CH2OH

    • CH3CH2CHO

    Choose your answer

    6
    1 mark

    How many σ (sigma) and π (pi) bonds are present in a molecule of methyl cyanide (CH3​CN)?

    • 4σ, 1π

    • 5σ, 1π

    • 5σ, 2π

    • 6σ, 2π

    Choose your answer

    7
    1 mark

    Acrylonitrile (propenenitrile) is a vital monomer used in the production of synthetic fibers. Its structural formula is CH2=CHCN.

    How many σ (sigma) and π (pi) bonds are present in one molecule of acrylonitrile?

    sigma (σ) bonds

    pi (π) bonds

    A

    4

    2

    B

    6

    1

    C

    6

    3

    D

    7

    3

      Choose your answer

      1
      1 mark

      Which is the shortest bond length in the following gases?

      • Oxygen-oxygen in oxygen gas, O2

      • Nitrogen-nitrogen in nitrogen gas, N2

      • Carbon-carbon in ethyne gas, C2H2

      • Oxygen-oxygen in ozone gas, O3

      Choose your answer

      2
      1 mark

      Which statement best describes the intramolecular bonding in a carbonate ion, CO32-?

      • Only London forces

      • Electrostatic attraction between pairs of electrons and positively charged nuclei

      • Permanent dipole permanent dipole forces

      • Electrostatic attraction between separate carbonate ions

      Choose your answer

      3
      1 mark

      The structure of the NO2 molecule is shown below. 

      screenshot-2024-03-28-121703

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

      • Methane

      • Ethene

      • Ethyne

      • Propane

      Choose your answer