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Transition elements

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Question 5

The compound C12Fe5N12\text{C}_{12}\text{Fe}_5\text{N}_{12}C12​Fe5​N12​ is a mixed-valence iron complex containing Fe2+\text{Fe}^{2+}Fe2+, Fe3+\text{Fe}^{3+}Fe3+, and CN−\text{CN}^-CN−.

What are the numbers of Fe2+\text{Fe}^{2+}Fe2+ and Fe3+\text{Fe}^{3+}Fe3+ ions in one formula unit of C12Fe5N12\text{C}_{12}\text{Fe}_5\text{N}_{12}C12​Fe5​N12​?

A

1 Fe2+\text{Fe}^{2+}Fe2+ and 4 Fe3+\text{Fe}^{3+}Fe3+

B

2 Fe2+\text{Fe}^{2+}Fe2+ and 3 Fe3+\text{Fe}^{3+}Fe3+

C

3 Fe2+\text{Fe}^{2+}Fe2+ and 2 Fe3+\text{Fe}^{3+}Fe3+

D

4 Fe2+\text{Fe}^{2+}Fe2+ and 1 Fe3+\text{Fe}^{3+}Fe3+

Markscheme

Transition elements Questions

  1. A Level
  2. /Chemistry
  3. /Transition elements

48 exam-style questions on OCR A A Level Chemistry Transition elements. Each one has a worked solution and a mark scheme showing where the marks go.

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