Ligand

What is a ligand?

• A molecule that removes electrons from a metal ion

• A type of transition metal ion

• A bond between two metal ions

• A molecule or ion that donates a lone pair of electrons to form a coordinate bond with a transition metal ion

What is the most common example of a monodentate ligand?

• H2O

• CO2

• NH3

• CH4

What is the coordination number of a complex ion with six coordinate bonds?

• 12

• 6

• 3

• 2

What does a bidentate ligand do?

• Removes electrons from a transition metal ion

• Donates three lone pairs of electrons

• Forms a single coordinate bond

• Donates two lone pairs of electrons from different atoms to form two coordinate bonds

What is the formula for ethylene diamine?

• NH3-CH2-CH2-NH3

• NH2-CH2-S-CH2-NH2

• NH2-CH2-CH2-NH2

• NH2-CH3-CH3-NH2

What is the 3D shape of a complex ion with six coordinate bonds?

• Octahedral

• Trigonal planar

• Linear

• Tetrahedral

What is the coordination number?

• The number of ligands in a complex ion

• The number of coordinate bonds in a complex ion

• The total number of electrons donated

• The charge on the transition metal ion

What is the abbreviation often used for ethylene diamine in exams?

• EM

• EA

• EN

• ED

What is the difference between monodentate and bidentate ligands?

• Monodentate ligands donate two lone pairs, while bidentate ligands donate one

• Monodentate ligands form two coordinate bonds, while bidentate ligands form one

• There is no difference

• Monodentate ligands donate one lone pair, while bidentate ligands donate two from different atoms

What are the most common transition metal ions seen at A level?

• Zinc (II), Silver (I), Gold (III)

• Sodium (I), Potassium (I), Magnesium (II)

• Copper (II), Cobalt (II), Iron (II) or Iron (III)

• Carbon (IV), Nitrogen (III), Oxygen (II)