The higher the electronegativity the greater the pull an oxidizing agent has for electrons. The higher the pull for electrons the stronger the oxidizing agent. Therefore we can say that the element having higher electronegativity will be the strongest oxidizing agent
For example, Find the stronger oxidizing agent among this potassium permanganate and hydrogen peroxide
H2O2(aq) + 2H+ (aq) + 2e- → 2H2O(l) ——-(1)
MnO-4(aq) + 8H+ (aq) + 5e- → Mn2+(aq) + 4H2O(l); ——-(2)
The half reactions are written above
E∘/V for (1) and (2) are 1.77 and 1.51
The more positive reduction potential, the stronger oxidizing agent. Therefore hydrogen peroxide is the strong oxidizing agent.