Lesson 3.1.2

3.1.2 Group 2 Quiz: OCR Chemistry, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.1.2, Group 2: 20 multiple choice questions for the OCR Chemistry (H432), Unit 2: Periodic table and energy, written with Revision Ninja.

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The 20 questions

  1. What is the outer shell electron configuration of Group 2 metals?

    • p1
    • s1
    • p2
    • s2

  2. What is the formula of the product when magnesium burns in oxygen?

    • MgO
    • Mg2O2
    • Mg2O
    • MgO2

  3. Which Group 2 metal reacts most vigorously with cold water?

    • Barium
    • Beryllium
    • Magnesium
    • Calcium

  4. Why does reactivity increase down Group 2?

    • Increasing electronegativity
    • Decreasing atomic radius
    • Decreasing ionisation energy
    • Increasing nuclear charge

  5. What is the hydroxide formed when calcium reacts with water?

    • CaO2H2
    • Ca2OH
    • CaOH
    • Ca(OH)2

  6. Which Group 2 oxide gives the most alkaline solution when dissolved in water?

    • Barium oxide
    • Beryllium oxide
    • Calcium oxide
    • Magnesium oxide

  7. What is the main agricultural use of calcium hydroxide?

    • Fertilising nitrogen-deficient soil
    • Neutralising acidic soil
    • Killing agricultural weeds
    • Inhibiting fungal growth

  8. Which compound is used as an antacid to treat indigestion?

    • Strontium chloride
    • Calcium sulfate
    • Magnesium hydroxide
    • Barium sulfate

  9. Which equation shows calcium carbonate neutralising acid?

    • CaO + 2H+ → Ca2+ + H2O
    • CaCO3 + 2H+ → Ca2+ + H2O + CO2
    • Ca(OH)2 + 2H+ → Ca2+ + 2H2O
    • CaCO3 + H+ → Ca2+ + HCO3-

  10. Why is barium more reactive with water than magnesium?

    • Higher electronegativity
    • Smaller atomic radius
    • Higher ionisation energy
    • Lower ionisation energy

  11. What is the oxidation number change when magnesium forms Mg2+?

    • +2 to 0
    • -2 to 0
    • 0 to +2
    • 0 to +1

  12. When magnesium burns in oxygen, which substance acts as the oxidising agent?

    • Oxygen
    • Oxide ion
    • Magnesium
    • Magnesium oxide

  13. Why does the alkalinity of Group 2 hydroxide solutions increase down the group?

    • Decreasing lattice enthalpy
    • Increasing ionisation energy
    • Increasing solubility
    • Decreasing solubility

  14. What gas is produced when magnesium reacts with dilute hydrochloric acid?

    • Chlorine
    • Hydrogen
    • Oxygen
    • Carbon dioxide

  15. Second ionisation energy is the energy required to remove one electron from one mole of which species?

    • Gaseous atoms
    • Gaseous 2+ ions
    • Gaseous 1+ ions
    • Solid 1+ ions

  16. How many moles are there in 0.500 g of Ca(OH)2? (Mr = 74.1)

    • 0.00500 mol
    • 0.370 mol
    • 0.0370 mol
    • 0.00675 mol

  17. What mass of CaO (Mr = 56.1) is needed to make 0.100 mol of Ca(OH)2?

    • 7.41 g
    • 5.61 g
    • 11.2 g
    • 0.100 g

  18. A 2.43 g sample of magnesium is burned completely in oxygen. What mass of MgO (Mr = 40.3) is formed?

    • 6.06 g
    • 2.03 g
    • 4.03 g
    • 2.43 g

  19. Why does magnesium react much more slowly with cold water than calcium does?

    • Soluble hydroxide formation
    • Stronger metallic bonding
    • Insoluble hydroxide coating
    • Higher atomic radius

  20. What are the products when barium reacts with water?

    • BaO(s) and H2(g)
    • Ba(OH)2(aq) and H2(g)
    • BaCl2(aq) and H2(g)
    • Ba(OH)2(s) and O2(g)

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