Reduction potentials of some ions are given below. Arrange them in decreasing order of oxidising power.

Ion

ClO4- IO4- BrO4-

Reduction potential E- /V

= 1.19V

= 1.65V

= 1.74V

1.  ClO4- > IO4- > BrO4-2.  IO4- > BrO4- > ClO4-3.  BrO4- > IO4- > ClO4-4.  BrO4- > ClO4- >  IO4- 

 
 
 



Hint: As the reduction potential increases, the oxidising power increases


Greater the SRP value of species higher will be its oxidizing power.

Species

Ecell°

ClO4-

IO4-

BrO4-

1.19 V

1.65 V

1.74 V

SRP of species increases.

Oxidizing power increase.

Here, SRP = standard reduction potential.