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CAIE A-Level Chemistry 28.2.5 Shapes of Transition-Metal Complexes

Practise recognising and drawing linear, tetrahedral, square-planar and octahedral complexes with correct bond angles.

Syllabus
2028–2030
Course
Chemistry 9701
Level
A2

Exam points

  • draw linear and square-planar complexes with ligand–metal–ligand angles of 180° and 90° respectively
  • use wedge-and-dash bonds to show tetrahedral geometry and label its bond angle as approximately 109.5°
  • draw six ligands octahedrally around the metal centre and identify adjacent 90° bond angles

28.2.5—Shapes of transition metal complexes question 1

[Maximum number: 1]

Copper is a transition element and has atomic number 29.

The following equilibrium exists between two complex ions of copper in the +2 oxidation state.

[Cu(H2O)6]2++4Cl−⇌[CuCl4]2−+6H2O\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}+4 \mathrm{Cl}^{-} \rightleftharpoons\left[\mathrm{CuCl}_{4}\right]^{2-}+6 \mathrm{H}_{2} \mathrm{O}

State the shape of the [CuCl4]2−\left[\mathrm{CuCl}_{4}\right]^{2-} ion.

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