Given that, E O 2 / H 2 O o = + 1 .23   V ; E S 2 O 8 2 - / SO 4 2 - o = 2 .05   V E Br 2 / Br - o…

For strongest oxidizing agent, the standard reduction potential should be highest.

An oxidizing agent, or oxidising agent is a substance that has the ability to oxidize other substances — in other words to accept their electrons. Common oxidizing agents are oxygen, hydrogen peroxide and the halogens.