CIE iGCSE Co-Ordinated Science C8.4 Transition elements Exam Style Questions Paper 1
▶️ Answer/Explanation
Transition elements, such as copper and iron, form coloured compounds due to the presence of partially filled d-orbitals. Electrons in these d-orbitals can absorb specific wavelengths of visible light, allowing transitions between different energy levels and resulting in the characteristic colours of their compounds. Group I, Group II, and Group VIII elements generally form colourless compounds.
✅ Answer: (D)
✅ Answer: (D)
▶️ Answer/Explanation
Element X acts as a catalyst — it increases the rate of reaction but is chemically unchanged at the end; this is a key property of transition elements (e.g. iron, nickel, platinum).
Transition elements are located in the central d-block region (between Groups II and III) of the Periodic Table, which corresponds to option D.
✅ Answer: (D)
Transition elements are located in the central d-block region (between Groups II and III) of the Periodic Table, which corresponds to option D.
✅ Answer: (D)
▶️ Answer/Explanation
Transition elements are typical metals with strong metallic bonding.
This strong bonding gives them high melting points and high densities.
They are good thermal conductors, not insulators, and are opaque, not transparent, ruling out C and D.
✅ Answer: (A)
This strong bonding gives them high melting points and high densities.
They are good thermal conductors, not insulators, and are opaque, not transparent, ruling out C and D.
✅ Answer: (A)
▶️ Answer/Explanation
Transition elements are characterised by high melting points (generally above 1000 °C); lead has a relatively low melting point of only 327 °C, which is uncharacteristic of true transition elements.
Conducting electricity, forming alloys, and having basic oxides are all typical properties of transition metals, so those are not the odd one out.
✅ Answer: (C)
Conducting electricity, forming alloys, and having basic oxides are all typical properties of transition metals, so those are not the odd one out.
✅ Answer: (C)
▶️ Answer/Explanation
Transition metals typically have high melting points due to strong metallic bonding.
They commonly act as catalysts in industrial reactions, such as iron in the Haber process.
They also form coloured compounds because of their variable oxidation states.
✅ Answer: (D)
They commonly act as catalysts in industrial reactions, such as iron in the Haber process.
They also form coloured compounds because of their variable oxidation states.
✅ Answer: (D)