Lesson 3.2.4

3.2.4 Properties of Period 3 elements and their oxides Quiz: AQA Chemistry, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.2.4, Properties of Period 3 elements and their oxides: 20 multiple choice questions for the AQA Chemistry (7405), Unit 2: Inorganic chemistry, written with Revision Ninja.

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The 20 questions

  1. Which Period 3 oxide has the highest melting point of the four: Na2O, MgO, SO3 and P4O10?

    • P4O10
    • MgO
    • SO3
    • Na2O

  2. What type of structure does silicon(IV) oxide, SiO2, have?

    • Metallic lattice
    • Giant ionic lattice
    • Giant covalent network
    • Simple molecular

  3. Which Period 3 oxide reacts with water to give a strongly alkaline solution with pH about 14?

    • P4O10
    • Na2O
    • SO2
    • Al2O3

  4. Which Period 3 oxide does not react with water?

    • SiO2
    • SO3
    • MgO
    • Na2O

  5. Which equation correctly represents the reaction of sodium with water?

    • Na + H2O -> NaOH + H2
    • 2Na + 2H2O -> 2NaOH + H2
    • Na + 2H2O -> NaOH + O2
    • 2Na + H2O -> Na2O + H2

  6. Which compound is formed when phosphorus burns in excess oxygen?

    • P2O5
    • PO2
    • P4O10
    • P2O3

  7. Which description best matches the reaction of magnesium with cold water?

    • Immediate formation of a strongly acidic solution
    • Very slow, with little visible reaction
    • Rapid release of oxygen gas
    • Vigorous, with a bright flame

  8. Which equation correctly represents sulfur trioxide reacting with water?

    • SO3 + H2O -> H2SO4
    • SO3 + H2O -> SO2 + H2O2
    • SO3 + 2H2O -> H4SO5
    • SO3 + H2O -> H2SO3

  9. What mass of magnesium oxide is formed when 2.4 g of magnesium burns completely in oxygen? (Ar: Mg = 24.0, O = 16.0)

    • 8.0 g
    • 4.0 g
    • 2.4 g
    • 6.0 g

  10. 0.50 mol of P4O10 reacts completely with excess water (P4O10 + 6H2O -> 4H3PO4). How many moles of H3PO4 are formed?

    • 0.50 mol
    • 4.0 mol
    • 2.0 mol
    • 1.0 mol

  11. Which equation shows sodium oxide reacting with hydrochloric acid?

    • Na2O + 2HCl -> 2NaCl + H2O
    • Na2O + 2HCl -> NaCl2 + H2O
    • Na2O + HCl -> Na + HClO
    • Na2O + HCl -> NaCl + H2

  12. Which reagent dissolves aluminium oxide, Al2O3, showing that it is amphoteric?

    • Pure water at room temperature
    • Dilute sodium hydroxide solution
    • Aqueous sodium chloride solution
    • Ethanol

  13. Which equation represents silicon(IV) oxide reacting with sodium hydroxide?

    • SiO2 + 2NaOH -> Na2SiO3 + H2O
    • SiO2 + NaOH -> NaSiO2 + H2
    • SiO2 + NaOH -> NaSiO3 + H2
    • SiO2 + 2NaOH -> Na2SiO2 + H2O2

  14. What is the oxidation state of sulfur in SO3?

    • +4
    • -2
    • +2
    • +6

  15. Which ion is the fully deprotonated form of phosphoric acid, H3PO4?

    • P2O7^4-
    • H2PO4^-
    • PO4^3-
    • PO3^3-

  16. Going across Period 3 from sodium to sulfur, how does the character of the oxides change?

    • Basic to acidic
    • Basic to amphoteric only
    • No change in character
    • Acidic to basic

  17. How many moles of Na2O react completely with 0.20 mol of HCl? (Na2O + 2HCl -> 2NaCl + H2O)

    • 0.10 mol
    • 0.20 mol
    • 0.40 mol
    • 0.05 mol

  18. Which Period 3 oxide has the lowest melting point?

    • MgO
    • Al2O3
    • SO2
    • Na2O

  19. Explain in terms of structure and bonding why SiO2 has a much higher melting point than SO2.

    • SiO2 is giant covalent with many strong bonds to break, while SO2 is simple molecular with only weak intermolecular forces
    • SO2 has delocalised electrons that make it harder to melt than SiO2
    • SiO2 has metallic bonding that is weaker than the forces between SO2 molecules
    • SiO2 has stronger hydrogen bonds between its molecules than SO2 has

  20. A student adds P4O10 to water and the solution becomes strongly acidic. Which statement best explains this?

    • P4O10 is a strong base that removes H+ ions from water
    • P4O10 dissolves to give a neutral salt solution
    • Phosphorus reacts with water to release oxygen gas
    • Phosphoric acid, H3PO4, forms and releases H+ ions into solution

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