Transition metals (A-level only)

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Question 21
Medium

This question is about complexes of transition metals.

1.

State the meaning of the term co-ordination number of a complex ion.

[1]
2.

The molecule H2OH_2OH2​O commonly acts as a ligand in transition metal chemistry.

The electron pair repulsion theory can be used to predict the shape of a H2OH_2OH2​O molecule. Draw the shape of a H2OH_2OH2​O molecule. Include any lone pairs of electrons that influence the shape. Name the shape.

[2]
3.

Nickel forms a complex with carbon monoxide, Ni(CO)4Ni(CO)_4Ni(CO)4​. Suggest why the oxidation state of nickel is zero in this complex.

[1]
4.

The compound [Co(NH3)4Cl2]NO3[Co(NH_3)_4Cl_2]NO_3[Co(NH3​)4​Cl2​]NO3​ contains ammonia ligands.

Deduce the oxidation state of cobalt in [Co(NH3)4Cl2]NO3[Co(NH_3)_4Cl_2]NO_3[Co(NH3​)4​Cl2​]NO3​.

[1]
5.

Name the type of bond formed between the nitrogen atom of the ammonia ligand and the central cobalt ion in this complex.

[1]
6.

The compound [Co(NH3)4Cl2]NO3[Co(NH_3)_4Cl_2]NO_3[Co(NH3​)4​Cl2​]NO3​ contains a complex ion that shows isomerism. One of its isomers is shown below:

trans isomer

Identify the isomer shown, draw the other isomer of the complex ion, and state the type of isomerism shown.

[3]
7.

Complete the equation to show the formation of the hexaaquacobalt(II) complex from anhydrous cobalt(II) chloride: CoCl2+6H2O→CoCl_2 + 6H_2O \rightarrowCoCl2​+6H2​O→

[1]

Transition metals (A-level only) Questions

  1. A Level
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