Redox Question: Which is Best Reducing Agent?

[geffman1]

Homework Statement

hey guys this question looks easy, but I am confused? any help/tips would be appreciated
Which of the following is the best reducing agent?

Cl2 + 2e- 2Cl-; E° = 1.36 V
Mg2+ + 2e- Mg; E° = -2.37 V
2H+ + 2e- H2; E° = 0.00 V

Homework Equations

The Attempt at a Solution

 

[symbolipoint]

You listed reaction half cells showing consumtion of electrons. What you want then is which half cell when written as a supplier of electrons would have the largest positive value?

 

[geffman1]

would that be mg? cuase when you flip you change the sign?

 

[Borek]

Obviously it has something to do with standard potentials listed, isn't it? So the real question is, do you need high or low potential for reduction... Is chlorine an oxidizing, or reducing agent? Once you will know answer, you will know which end of the scale is which.