IB Chemistry Topic 13

Which of the following complexes has a coordination number of 6?

• [Co(NH₃)₆]³⁺

• MnO₄^-

• [CuCl₄]^2-

• [Ag(NH₃)₂]⁺

Which of the following is a necessary feature of all ligands?

• a negative charge

• an electronegative atom

• the presence of a lone pair of electrons

• the presence of two or more atoms

Which of the following elements would be expected to be paramagnetic?

• Ca

• Zn

• He

• Mn

Tags

NGSS.HS-PS1-1

Which of the following best explains why [Fe(H₂O)₆]³⁺ and [Fe(H₂O)₆]²⁺ are different colors?

• The ligands have a different charge density

• The nuclear charge of the metals is different

• The number of d electrons present on each of the metals

• The geometry of the complex ion

Why are transition metal complexes colored?

• A wavelength is emitted when higher energy electrons transition to lower energy

• Light is absorbed when higher energy electrons transition to lower energy, transmitting a wavelength

• Light is absorbed in order to transition lower energy electrons to higher energy, causing the transmitted light to appear colored

• Light is absorbed to transition electrons, then re-emitted when the electrons fall to lower energy.

Tags

NGSS.HS-PS4-3

What causes the d orbital to split?

• Overlap of d-orbitals and ligand lone pair

• Magnetism between unpaired electrons

• Light energizes the orbitals

• They just don't like each other

What is an example of a polydentate substance?

• water

• ammonia

• EDTA

• Cyanide

What is the coordination number?

• The number of lone pairs bonded to the central metal

• The number of ligands bonded to the central metal

• The oxidation number

• The number or ions bonded to the complex ion

How should an oxidation number of positive 3 be written?

• 3+

• +3

Which of these cannot act as a ligand?

• H₂O

• CN^-

• NH₄⁺

• Cl^-