Lesson 5.3.1

5.3.1 Transition elements Quiz: OCR Chemistry, Unit 4

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 5.3.1, Transition elements: 20 multiple choice questions for the OCR Chemistry (H432), Unit 4: Physical chemistry and transition elements, written with Revision Ninja.

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The 20 questions

  1. Which element is NOT a transition element according to the definition of a d-block element with an ion that has an incomplete d sub-shell?

    • Titanium
    • Iron
    • Zinc
    • Copper

  2. What is the electron configuration of the Fe2+ ion?

    • [Ar] 3d4 4s2
    • [Ar] 4s2 3d4
    • [Ar] 3d8
    • [Ar] 3d6

  3. Which ion has no electrons in a d sub-shell and is therefore not a transition element ion?

    • Ti3+
    • Cr3+
    • Fe3+
    • Sc3+

  4. What is the coordination number and shape of the hexaaquacopper(II) ion, [Cu(H2O)6]2+?

    • 4, tetrahedral
    • 6, tetrahedral
    • 4, square planar
    • 6, octahedral

  5. What type of bond is formed when a ligand binds to a transition metal ion?

    • Covalent bond
    • Ionic bond
    • Coordinate bond
    • Metallic bond

  6. Which ligand is bidentate?

    • Water, H2O
    • 1,2-diaminoethane, NH2CH2CH2NH2 (en)
    • Chloride ion, Cl-
    • Ammonia, NH3

  7. Which complex ion has a tetrahedral shape?

    • [Fe(H2O)6]3+
    • CuCl4^2-
    • [Cu(H2O)6]2+
    • [Pt(NH3)2Cl2]

  8. What type of stereoisomerism is shown by the complex cis-platin, Pt(NH3)2Cl2?

    • cis-trans isomerism
    • Optical isomerism
    • Structural isomerism
    • Conformational isomerism

  9. How does the anti-cancer drug cis-platin prevent cell division?

    • Binds to RNA
    • Inhibits enzymes
    • Binds to DNA
    • Blocks ion channels

  10. Which transition metal compound catalyses the decomposition of hydrogen peroxide?

    • CuSO4
    • Fe2O3
    • V2O5
    • MnO2

  11. What type of bond connects ligands to a central metal ion in a complex ion?

    • Metallic
    • Ionic
    • Dative covalent
    • Non-polar covalent

  12. Which equation correctly represents the ligand substitution of [Cu(H2O)6]2+ by excess chloride ions?

    • [Cu(H2O)6]2+ + 4Cl- -> [CuCl4(H2O)2]2+ + 4H2O
    • [Cu(H2O)6]2+ + 2Cl- -> [CuCl2]2+ + 6H2O
    • [Cu(H2O)6]2+ + 4Cl- -> [CuCl4]2- + 6H2O
    • [Cu(H2O)6]2+ + Cl- -> [CuCl]+ + 5H2O

  13. What is observed when excess aqueous ammonia is added to copper(II) hydroxide precipitate?

    • Deep blue solution
    • Green solution
    • Pale blue precipitate
    • Yellow solution

  14. Which transition element ion forms a grey-green hydroxide precipitate that dissolves in excess aqueous sodium hydroxide?

    • Mn2+
    • Cu2+
    • Cr3+
    • Fe2+

  15. What colour precipitate forms when aqueous sodium hydroxide is added to aqueous iron(III) ions?

    • Pale green
    • Grey-green
    • Deep blue
    • Rust-brown

  16. What type of reaction occurs when ammonia replaces water molecules in a complex ion?

    • Ligand substitution
    • Redox
    • Precipitation
    • Electrophilic addition

  17. What colour change marks the end point when titrating Fe2+ with acidified MnO4-?

    • Orange to green
    • Colourless to pink
    • Purple to orange
    • Pink to purple

  18. What is the reacting mole ratio of MnO4- to Fe2+ in an acidified redox titration?

    • 1 to 5
    • 5 to 1
    • 2 to 5
    • 1 to 1

  19. Which ion has the electron configuration [Ar] 3d3?

    • Fe3+
    • Mn2+
    • Cr3+
    • Ti3+

  20. What is the electron configuration of a copper atom, Cu?

    • [Ar] 3d9 4s2
    • [Ar] 3d10 4s1
    • [Ar] 3d10 4s2
    • [Ar] 3d9 4s1

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