Complex ions

Question 1

How many NH3/H2O/Small ligands can fit around a central atom

Answer 1

6

Question 2

How many Cl- can fit around a central atom

Answer 2

4

Question 3

How many Ethanedioate or Ethane,1,2 diamine can fit around a central atom?

Answer 3

3

Question 4

Does a ligand donate or accept electronsv

Answer 4

Donate

Question 5

What shape do 6 coordinate bonds/coordinate NO. 6 form? Give an example

Answer 5

Octahedral 90°, [Fe(H2O)6]2+ or [Co(NH3)6]3+ or [Cu(NH3)4(H2O)2]2+

Question 6

What shape do 4 coordinate bonds/coordinate NO.4 form? Give an example

Answer 6

Tetrahedral 109.5°, [CuCl4]2- or [CoCl4]2-

and Square planar 90° Cis-platin is square planar [Pt(NH3)2 Cl2]

Question 7

What shape do 2 coordinate bonds/coordinate NO.2 form? Give an example.

Answer 7

Linear 180°, [Ag(NH3)2]2+ Tollen’s reagent

Question 8

Give all examples of mono/unidentate ligands

Answer 8

H2O:, :NH3, :Cl-

Question 9

Give all examples of bidentate ligands

Answer 9

Ethanedioate and Ethane-1,2-diamine

Question 10

Give all examples of polydentate ligands

Answer 10

EDTA-4 (6 coord bonds)

Question 11

What forms Haem in a Haemoglobin molecule

Answer 11

The Fe central atom and it’s four coordinate bonds with four Nitrogens

Question 12

Where does the 6th nitrogen in Haem come from

Answer 12

Globin protein

Question 13

Which complexes undergo optical isomerism

Answer 13

Octahedral complexes with 3 bidentate ligands

Question 14

Which complexes undergo cis-trans/E-Z isomerism

Answer 14

1. Octahedral complexes with four monodentate ligands of the same type and 2 a different type
2. Square planar complexes with two different ligand pairs

Question 15

Which type of ligands form more stable complexes

Answer 15

Multidentate

Question 16

How does entropy affect complex stability

Answer 16

Increase in entropy makes a more stable complex

Question 17

What is the iron oxidation state in haemoglobin?

Answer 17

Fe 3+