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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 
O
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. 

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4 - 5)

Species Bond order Interatomic distance (pm) Bonding energy (kJ mol-1
O2  2 121 490
O+2 2.5 112 625
O-2 1.5 132 -
O2-2 1 149 200

(6) Ion F2−2does not exist.The number of electrons in the bonding and antibonding orbitals would be the same and thus,the bonding F–F cannot be formed.Therefore,there exists no compound containing ion F2-2.

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