IB Diploma Chemistry chapter 2: Structure 2: Models of bonding and structure MCQs with answers

By Team Megalecture · Updated 4 Nov 2026

37 exam-style questions on Structure 2: Models of bonding and structure, each with the answer and a short explanation. Ten of them are below to try. The chapter test draws ten fresh questions each time and is marked the moment you finish, with your score by topic.

37 questions · 4 topics · 10 per test

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What chapter 2 covers

Ten Structure 2: Models of bonding and structure questions with answers

Try each one, then open the answer. These ten stay the same; the test draws new ones every time.

1. What is the monomer of poly(propene)?

  1. A
    CH3CH2CH3
  2. B
    CH2=CH2
  3. C
    CH2=CHCl
  4. D
    CH2=CHCH3
Show answer

Answer: D. Addition polymers form from alkenes: propene, CH2=CHCH3, opens its C=C bond. Propane has no double bond, so it cannot polymerize.

2. Which statement about diamond and graphite is correct?

  1. A
    diamond conducts electricity because each carbon atom has a free electron
  2. B
    graphite conducts electricity because each carbon atom forms three covalent bonds, leaving one electron delocalized
  3. C
    graphite is harder than diamond because its layers are tightly packed
  4. D
    diamond is slippery because weak forces hold its layers together
Show answer

Answer: B. In graphite each C bonds to three others in layers, with one delocalized electron per atom. In diamond all four electrons are in bonds, so it does not conduct and has no layers.

3. Hydrogen bonds form between molecules of which substance?

  1. A
    CH3CH2OH
  2. B
    HCl
  3. C
    CH3OCH3
  4. D
    CH3CHO
Show answer

Answer: A. Hydrogen bonding needs H bonded directly to N, O or F. Ethanol has an O–H group; in methoxymethane and ethanal all H atoms are on carbon, and Cl is not electronegative enough.

4. Why are metals good conductors of heat?

  1. A
    the cations move freely from the hot end to the cold end
  2. B
    delocalized electrons move freely and pass kinetic energy through the lattice
  3. C
    metals have low melting points
  4. D
    the ionic bonds in the lattice vibrate strongly
Show answer

Answer: B. Mobile electrons carry energy quickly through the metal, in addition to vibrations passed between cations. The cations do not travel through the lattice.

5. An element forms two chlorides with the formulas XCl2 and XCl3. Which element could X be?

  1. A
    iron
  2. B
    aluminium
  3. C
    magnesium
  4. D
    sodium
Show answer

Answer: A. Transition elements such as iron can form more than one stable ion (Fe2+ and Fe3+). Mg, Al and Na each form only one ion.

6. What is the molecular geometry and approximate bond angle of a water molecule?

  1. A
    linear, 180°
  2. B
    tetrahedral, 109.5°
  3. C
    trigonal pyramidal, about 107°
  4. D
    bent (V-shaped), about 105°
Show answer

Answer: D. Oxygen has four electron domains (two bonds, two lone pairs). Lone pairs repel more than bonding pairs, squeezing the angle from 109.5° to about 105°; the shape of the atoms is bent.

7. Which molecule contains a triple bond?

  1. A
    O2
  2. B
    C2H4
  3. C
    CO2
  4. D
    N2
Show answer

Answer: D. Each N atom has five outer electrons and shares three pairs to complete its octet, N≡N. O2, CO2 and C2H4 contain double bonds.

8. A solid has a very high melting point, does not conduct electricity when solid or molten, and is insoluble in water. What is its most likely structure?

  1. A
    ionic lattice
  2. B
    metallic lattice
  3. C
    covalent network
  4. D
    simple molecular
Show answer

Answer: C. A very high melting point with no conduction even when molten fits a covalent network (like diamond or SiO2). Ionic compounds conduct when molten; simple molecular substances melt at low temperatures.

9. Why do ionic compounds have low volatility and high melting points?

  1. A
    strong electrostatic attractions act in all directions throughout the lattice and need a lot of energy to overcome
  2. B
    the covalent bonds inside each ion are very strong
  3. C
    there are strong intermolecular forces between ion-pair molecules
  4. D
    the ions are held together by delocalized electrons
Show answer

Answer: A. Melting requires overcoming the many strong attractions between oppositely charged ions in the giant lattice. There are no molecules or delocalized electrons involved.

10. Element X has the electron configuration 1s2 2s2 2p6 3s2 3p4. What is the formula of the ion it usually forms?

  1. A
    X2−
  2. B
    X4+
  3. C
    X2+
  4. D
    X6−
Show answer

Answer: A. With six outer electrons, X (sulfur) gains two electrons to reach the stable argon configuration, forming X2−.

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Ways to practise this chapter

Structure 2: Models of bonding and structure: questions students ask

How many Structure 2: Models of bonding and structure MCQs are there?

37, each with the answer and a short explanation, across 4 topics: S2.1 The ionic model, S2.2 The covalent model, S2.3 The metallic model, S2.4 From models to materials. Every chapter test draws ten of them, so you can take it many times.

Is the IB Diploma Chemistry chapter 2 test free?

Yes. The test, the answers and the explanations are free and need no sign-up. Sign in only if you want your scores kept across devices.

How is the chapter test marked?

The moment you press Finish: your score, the right answer and an explanation for every question, and the ones you got wrong saved in My mistakes to retry.

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