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Bi(V) and Sb(V) which may be a stronger ...

`Bi(V)` and `Sb(V)` which may be a stronger oxidizing agent and why ?

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Bi (III) is more stable than Sb III) due to greater inert pair effect. This means that Bi (V) has more tendecy to change to Bi (III) as compared to Sb(V). As a result, the electron accepting tendency of Bi (V) is more or it is a stronger oxidant agent as compared to Bi (III).
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