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Transition elements

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Question 13

The compound C11Co4N11\text{C}_{11}\text{Co}_4\text{N}_{11}C11​Co4​N11​ is a mixed-valence cobalt complex containing Co2+\text{Co}^{2+}Co2+, Co3+\text{Co}^{3+}Co3+, and CN−\text{CN}^-CN− ions.

What are the numbers of Co2+\text{Co}^{2+}Co2+ and Co3+\text{Co}^{3+}Co3+ ions in one formula unit of C11Co4N11\text{C}_{11}\text{Co}_4\text{N}_{11}C11​Co4​N11​?

A

1 Co2+\text{Co}^{2+}Co2+ and 3 Co3+\text{Co}^{3+}Co3+

B

2 Co2+\text{Co}^{2+}Co2+ and 2 Co3+\text{Co}^{3+}Co3+

C

3 Co2+\text{Co}^{2+}Co2+ and 1 Co3+\text{Co}^{3+}Co3+

D

4 Co2+\text{Co}^{2+}Co2+ and 0 Co3+\text{Co}^{3+}Co3+

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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