The order of decreasing strength as oxidizing agent is Br₂ > Cu²⁺ > Fe³⁺.
Standard reduction potential is defined as the reducing power of any element or compound
The standard reduction potential of Fe³⁺ is 0.77V.
The standard reduction potential of Br₂ is 1.09V.
The standard reduction potential of Cu²⁺ is 0.34V.
The species or compound which reduce itself and oxidize other species or compound by accepting electron is termed as oxidizing agent.
As we know that, with the increase in the standard reduction potential, the oxidizing power of particular species increases.
The increasing order of standard reduction potential is Cu²⁺ < Fe³⁺ < Br₂.
Thus, the decreasing strength as oxidizing agent is Br₂ > Cu²⁺ > Fe³⁺.
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