Formation of complexes

Ligand is ___.

• ions or molecules with lone pair electrons which are donated readily to form dative/coordinate bond with the central metal ion

• ions with lone pair electrons which are donated readily to form dative/coordinate bond with the central metal ion.

• lone pair electron which are donated readily to form dative/coordinate bond with the central metal ion.

• ions or molecules with lone pair electrons which are donated readily to the central metal ion

Which of the following is NOT a monodentate ligand?

• Br^-

• SCN-

• C₂O₄^2-

• CO

Choose the monodentate ligands.

• Ammine, NH₃

• Aqua, H₂O

• Carbonyl, CO

• Ethylenediamine, EDTA₄^-

• Thiocynato, SCN^-

Name this ligand.

Choose the correct match.

(ligand = name)

• H₂O = aqua

• NH₃ = amine

• C₂O₄^2- = oxalato

• NH₂CH₂CH₂NH₂ = ethanedioato

• NH₂CH₂CH₂NH₂ = ethylenediamine

_____ is knows as the number of coordinate bonds formed between the ligands and the central metal ions

• ligand number

• coordination number

• coordinate number

• central number

• Null number

Transition metals can form variable complexes.

This ability is due to _

• availability of empty orbitals not only on the 3d orbitals, but also in 4s and 4p orbitals.

• energy gap between 3d and 4s is very small.

• they are able to form different oxidation numbers.

• they are transition elements.

• their are able to accommodate many lone pairs

What is the maximum lone pairs a central metal atom/ion can accept?

• 2

• 4

• 6

• 8

• No limit

During the formation of complexes, the central ion acts as __

• electron pair donor

• electron pair acceptor

• Lewis acid

• Lewis base

• ligand

Which of the following statements about this complex is true?

• It is octahedral in shape

• The oxidation state for copper is +2

• Ionic bonds exist between Cu2+ and H₂O

• Coordination number is 6

• Coordinate bond is formed between copper(II) ion and oxygen atoms of the water molecules