Question

Which of the following redox couple is stronger oxidizing agent?

a. Cl₂ (E⁰ = 1.36 V) and Br₂ (E⁰ = 1.09 V) 

b. MnO₄^Θ(E⁰ = 1.51 V) and Cr₂O₇^2Θ (E⁰ = 1.33 V)

Answer 1

a. Cl₂ (E⁰ = 1.36 V) and Br₂ (E⁰ = 1.09 V)

Cl₂ has a larger positive value of E⁰ than Br₂. 

Thus,

Cl₂ is a stronger oxidizing agent than Br₂.

b. MnO₄^Θ(E⁰ = 1.51 V) and Cr₂O₇^2Θ (E⁰ = 1.33 V)

MnO₄^Θ has larger positive value of E⁰ than Cr₂O₇^2Θ. 

Thus,

MnO₄^Θ is stronger oxidizing agent than Cr₂O₇^2Θ.