Standard electrode potentials of redox couples `A^(2+)//A, B^(2+)//B, C^(2+)//C` and `D^(2+)//D` are 0.3 V, -0.5 V, -0.75 V and 0.9 V respectively. Which of these is best oxidising agent and reducing agent respectively?

Options

A. `D^(2+)//D` and `B^(2+)//B`
B. `B^(2+)//B` and `D^(2+)//D`
C. `D^(2+)//D` and `C^(2+)//C`
D. `C^(2+)//C` and `D^(2+)//D`

Answer

C

Explanation

The redox couple with maximum reduction potential will be best oxidising agent with minimum reduction potential will be best reducing agent.