coordination chemistry

what is the oxidation number of manganese in K4[Mn(CN)6]?

• +3

• +6

• +2

• +4

The cyanide ion acts as a ligand when it is bonded to a manganese ion. What is the best description of how the cyanide ion is bonded to the manganese ion in the complex in K4[Mn(CN)6]:

• CN- ion is bonded by a dative covalent/ co-ordinate because CN- ion attracts both its electrons away from manganese.

• CN- ion is bonded by ionic bonds because CN- donates both its electrons to the metal.

• CN- ion is not bonded to manganese

• CN- ion is bonded by a dative covalent/ co-ordinate because CN- ion donates both its electrons.

Name the shape of the [Mn(H2O)6]2+ ion:

• Octahedral

• Tetrahedral

• Linear

• Square pyramidal

Ti4+ ion are white when solid. However, compounds that contain the Ti3+ ion are often coloured violet. Suggest a reason for this difference:

• In Ti4+ ion there is one electron in a d subshell

• The d orbitals in the Ti3+complex are split by ligand field.

• Ti4+(aq) ions have filled d electrons hence these transitions are not possible.

• Ti4+(aq) ions have filled d electrons hence these transitions are possible

What is the coordination number of the [Co(H2O)6]2+ ion.

• 6

• 8

• 2

• 9

What is the oxidation number of [Co(H2O)6]2+

• +2

• +6

• +8

• -2

What is the oxidation number of the metal in this [Co(H2O)6]2+ ion?

• +8

• +6

• +2

• +3

Name the shape of cobalt-containing complex ion in [CoCl4]2-

• Octahedral

• pyramidal

• Tetrahedral

• square pyramidal

Define the term oxidation number

• The number of protons lost in the element

• The atomic mass number

• The number of ligands that bind to the element

• The state of charge, an atom or element or ionic species

What is the correct nomenclature for the ion [Co(NH3)4Cl2]Cl

• Tetraamminechlorocobalt(III) chloride

• Tetraamminedichlorocobalt(III) chloride

• Triamminedichlorocobalt(III) chloride

• Tetrachoroamminedichlorocobalt(III) chloride