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Transition elements

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Question 8

A mixed-valence manganese complex has the empirical formula C18Mn7N18\text{C}_{18}\text{Mn}_7\text{N}_{18}C18​Mn7​N18​. This compound consists of Mn2+\text{Mn}^{2+}Mn2+ ions, Mn3+\text{Mn}^{3+}Mn3+ ions, and cyanide (CN−\text{CN}^-CN−) ligands.

What are the numbers of Mn2+\text{Mn}^{2+}Mn2+ and Mn3+\text{Mn}^{3+}Mn3+ ions in one formula unit of this complex?

A

4 Mn2+ and 3 Mn3+4\text{ Mn}^{2+}\text{ and }3\text{ Mn}^{3+}4 Mn2+ and 3 Mn3+

B

3 Mn2+ and 4 Mn3+3\text{ Mn}^{2+}\text{ and }4\text{ Mn}^{3+}3 Mn2+ and 4 Mn3+

C

2 Mn2+ and 5 Mn3+2\text{ Mn}^{2+}\text{ and }5\text{ Mn}^{3+}2 Mn2+ and 5 Mn3+

D

5 Mn2+ and 2 Mn3+5\text{ Mn}^{2+}\text{ and }2\text{ Mn}^{3+}5 Mn2+ and 2 Mn3+

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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