Standard electrode potentials of redox couples `A^(2+)//A,B^(2+)//B,C^(2+)//C and D^(2+)//D ` are 0.3V,-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 and with minimum reduction potential will be best reducing agent.