The order of increasing strength as oxidizing agents
Cr₂O₇²⁻ > Ag+ > Ca²⁺.
Standard reduction potential is defined as the the reducing power of any element or compound.
The standard reduction potential of Ag+ is 0.7996 V.
The standard reduction potential of Ca²⁺ is -2. 86 V
The standard reduction potential of Cr₂O₇²⁻ is 1.23V
The species or compound which reduce itself and oxidize other species or compound by accepting electron is termed as oxidizing agents.
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 Cr₂O₇²⁻ > Ag+ > Ca²⁺.
Thus, the increasing increasing strength as oxidizing agents is
Cr₂O₇²⁻ > Ag+ > Ca²⁺.
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