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CAIE A-Level Chemistry A2 28.1.4 Why Transition Elements Have Variable Questions

Practise explaining variable oxidation states through the similar energies of the 3d and 4s subshells.

Syllabus
2028–2030
Course
Chemistry 9701
Level
A2

Exam points

  • state that the occupied 3d and 4s subshells are close or similar in energy
  • explain that different numbers of 3d and 4s electrons can therefore be removed or used in bonding
  • link this electron participation to formation of several stable oxidation states such as Fe2+ and Fe3+

CAIE A-Level Chemistry A2 28.1.4 Why Transition Elements Have Variable Questions question 1

[Maximum number: 1]

Fe2+\mathrm{Fe}^{2+} ions can be oxidised to Fe3+\mathrm{Fe}^{3+} ions under alkaline conditions by suitable oxidising agents.

Iron is a transition element. Explain why iron forms stable compounds in both the +2 and the +3 oxidation states.

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