9. Standard reduction potentials of the half reactions are given below:
F2(g) + 2e– → 2F– (aq); E0 = +2.85V
Cl2(g) + 2e– → 2Cl– (aq); E0 = +1.36 V
Br2(g) + 2e– → 2Br– (aq); E0 = +1.06 V
I2(g) + 2e– → 2I– (aq) ; E0 = +0.53 V
The strongest oxidising and reducing agents respectively are:
(1) Cl2 and I2 (2) F2 and I–
(3) Br2 and Cl– (4) Cl2 and Br–