Question

Which of the following represent correct order of decreasing ${\text{E}}_{\text{ox}}^{\text{O}}$ or reducing nature?

• A. $Li>Na>K>Rb$
• B. $Rb>K>Na>Li$
• C. $Rb>Li>Na>K$
• D. $Li>Rb>K>Na$

Answer 1

The correct option is A $Li>Na>K>Rb$

Oxidation potential is the potential at which oxidation (removal of $e^{-}$) occurs at anode in an electrochemical cell.

$Li>Na>K>Rb$

$Li$ has high due to its' small size and as we move down size increases and hence oxidation potential decreases.