3.1.3.2 Nature of covalent and dative covalent bonds Quiz: AQA Chemistry, Unit 1

The 20 questions

1. What is contained within a single covalent bond?

   • Two shared pairs
   • One shared pair
   • Three shared pairs
   • One transferred electron

2. How is a dative covalent bond represented in structural diagrams?

   • A dashed line
   • A double line
   • An arrow
   • A solid line

3. How many electrons does the donor atom supply to a dative covalent bond?

   • Two electrons
   • Zero electrons
   • One electron
   • Four electrons

4. How many shared pairs of electrons are in a triple bond?

   • 3
   • 1
   • 4
   • 2

5. Which molecule contains a double bond?

   • Methane, CH4 gas
   • Water, H2O liquid
   • Oxygen molecule, O2
   • Ammonia, NH3 gas

6. Which species contains a co-ordinate bond?

   • CH4
   • NH3
   • H2
   • NH4+

7. Which bond is formed when both electrons of a shared pair come from one atom?

   • Single covalent
   • Dative covalent
   • Ionic
   • Double covalent

8. How many shared pairs of electrons are in a molecule of nitrogen, N2?

   • 3
   • 2
   • 6
   • 1

9. Which species donates the lone pair of electrons when forming an ammonium ion?

   • Hydrogen ion
   • Ammonium ion
   • Nitride ion
   • Ammonia

10. In the compound BF3 + NH3 -> H3N-BF3, which atom is the acceptor of the electron pair?

    • Nitrogen
    • Boron
    • Fluorine
    • Hydrogen

11. How many shared pairs of electrons are present in a molecule of carbon monoxide, CO?

    • 4
    • 6
    • 2
    • 3

12. Which species acts as the electron pair donor in forming the hydronium ion, H3O+?

    • Hydroxide ion
    • Water
    • Oxide ion
    • Hydrogen ion

13. What feature must a species possess to act as an electron-pair donor?

    • An empty orbital
    • A double bond
    • A positive charge
    • A lone pair

14. How many shared pairs of electrons are in one molecule of ethene, C2H4?

    • 4
    • 5
    • 6
    • 8

15. How many shared pairs of electrons are in one molecule of hydrogen cyanide, HCN?

    • 2
    • 3
    • 6
    • 4

16. Why can boron trifluoride accept a lone pair of electrons from ammonia?

    • Incomplete outer shell
    • Complete outer shell
    • High electronegativity
    • Positive ionic charge

17. How many electrons does the N-H dative bond in NH4+ contain?

    • 4
    • 3
    • 1
    • 2

18. Where do both shared electrons in a dative covalent bond originate from?

    • Both bonded atoms
    • Delocalised electron sea
    • An ionic lattice
    • One single atom

19. How many shared pairs of electrons are in one molecule of ethanol, C2H5OH?

    • 7
    • 9
    • 8
    • 10

20. How many shared pairs of electrons are present in a covalent double bond?

    • Three pairs
    • Two pairs
    • Four pairs
    • One pair

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