Lesson 2.1.2

2.1.2 Compounds, formulae and equations Quiz: OCR Chemistry, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 2.1.2, Compounds, formulae and equations: 20 multiple choice questions for the OCR Chemistry (H432), Unit 1: Foundations in chemistry, written with Revision Ninja.

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The 20 questions

  1. What is the formula of aluminium sulfate?

    • Al3(SO4)2
    • Al2SO4
    • AlSO4
    • Al2(SO4)3

  2. What is the name of the ion CO3 2-?

    • carbide
    • carbonate
    • carbonite
    • hydrogencarbonate

  3. Which is the correct formula for zinc nitrate?

    • Zn(NO3)2
    • Zn(NO3)3
    • Zn2NO3
    • ZnNO3

  4. Which is the correct ionic equation for aqueous silver nitrate and aqueous sodium chloride forming a precipitate?

    • Ag+(s) + Cl-(aq) → AgCl(s)
    • Ag+(aq) + Cl-(aq) → AgCl(aq)
    • Ag(s) + Cl2(g) → AgCl(s)
    • Ag+(aq) + Cl-(aq) → AgCl(s)

  5. Which equation for magnesium reacting with dilute hydrochloric acid is correctly balanced with state symbols?

    • Mg(s) + HCl(aq) → MgCl(aq) + H2(g)
    • Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
    • Mg(s) + 2HCl(aq) → MgCl2(s) + H2(g)
    • Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(l)

  6. Which is the correct formula for calcium phosphate, containing Ca2+ and PO4 3- ions?

    • Ca3PO4
    • Ca2PO4
    • Ca3(PO4)2
    • CaPO4

  7. Which ion has the formula NH4+?

    • nitrite
    • nitride
    • hydroxonium
    • ammonium

  8. Balance C3H8 + O2 → CO2 + H2O. What is the coefficient of O2 in the balanced equation written with whole numbers?

    • 5
    • 4
    • 10
    • 3

  9. In Fe2O3 + CO → Fe + CO2, what is the coefficient of CO when the equation is balanced with whole numbers?

    • 6
    • 1
    • 2
    • 3

  10. What is the ionic equation for hydrochloric acid reacting with sodium hydroxide solution?

    • Na+(aq) + Cl-(aq) → NaCl(s)
    • H+(aq) + Cl-(aq) → HCl(aq)
    • H2(g) + OH-(aq) → H2O(l)
    • H+(aq) + OH-(aq) → H2O(l)

  11. In aqueous Na2SO4 reacting with aqueous BaCl2 to form a BaSO4 precipitate, which ions are spectator ions?

    • Na+ and Cl-
    • Ba2+ and SO4 2-
    • Ba2+ and Cl-
    • Na+ and SO4 2-

  12. How many moles of oxygen atoms are present in 2 mol of calcium nitrate, Ca(NO3)2?

    • 12
    • 4
    • 6
    • 8

  13. Which is the correct formula for iron(III) sulfate?

    • Fe3(SO4)2
    • Fe2SO4
    • Fe2(SO4)3
    • FeSO4

  14. Which balanced equation represents copper(II) oxide reacting with dilute sulfuric acid?

    • CuO(s) + 2H2SO4(aq) → CuSO4(aq) + H2O(l)
    • Cu(s) + H2SO4(aq) → CuSO4(aq) + H2(g)
    • CuO(s) + H2SO4(aq) → Cu(SO4)2(aq) + H2O(l)
    • CuO(s) + H2SO4(aq) → CuSO4(aq) + H2O(l)

  15. What is the systematic name of Fe(NO3)3?

    • iron(III) nitrate
    • iron(III) nitrite
    • iron trinitrate
    • iron(II) nitrate

  16. How many silver ions balance the ionic equation: Zn + Ag+ → Zn2+ + Ag?

    • 2
    • 3
    • 4
    • 1

  17. In 4Al + 3O2 → 2Al2O3, how many moles of O2 are needed to react completely with 9 mol of Al?

    • 12 mol
    • 6.75 mol
    • 9 mol
    • 3 mol

  18. How many ions are present in one formula unit of aluminium sulfate, Al2(SO4)3?

    • 5
    • 2
    • 3
    • 7

  19. Which is the correct formula for the compound of lithium ions and oxide ions?

    • Li2O
    • LiO
    • Li2O2
    • LiO2

  20. How many moles of nitric acid are needed to neutralise 0.10 mol of calcium hydroxide?

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

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