It is possible to prepare compounds containing ions O-2, O2-2 or even O+2. These ions are usually formed from molecules of oxygen during various reactions, as indicated in the scheme below:
(1) Indicate clearly which of the above reactions correspond to the oxidation and which to the reduction of the oxygen molecule.
(2) For each of the ions in the scheme give the formula of a compound containing that particular ion.
(3) It has been found that one of the species in the scheme is diamagnetic. Which one is it?
(4) Copy out the following table
Species |
Bond order |
Interatomic distance |
Bonding energy |
O2 |
|
|
|
O+2 |
|
|
|
O-2 |
|
|
|
O2-2 |
|
|
|
The interatomic distances, O-O, in the above species have the values 112, 121, 132 and about 149 pm. Write these values in the appropriate column in the table. 1 pm = 10-12 m.
(5) Determine the bond order for the individual species and write the answers in the table.
(6) Is it possible to prepare compounds containing the F2−2 ion? Give reasons for your answer.