Question

The standard redox potentials Eº of the following systems are :

System	Eº (volts)
(i) MnO4 – + 8H+ + 5e→Mn2+ + 4H2O	1.51
(ii) Sn4+ + 2e→  Sn2+	0.15
(iii) Cr2O7 2– + 14H+ + 6e→ 2Cr3+ + 7H2O	1.33
(iv) Ce4+ + e→ Ce3+	1.61

The oxidising power of the various species decreases in the order-

Answer 1

Correct option: (b)

Explanation:

The redox system having the highest redox potential in the most powerful oxidising agent followed by the one with the lower redox potential.