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Give the chemical reaction to support th...

Give the chemical reaction to support that `+5` oxidation state of `Bi` is less stable than `+3` state.

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Due to inert pair effect, `Bi` can show `+3` and `+5` oxidation states. Since the inert pair effect is maximum in case of `Bi`, therefore, its `+5` oxidation state is less stable than `+3` oxidation state.This is evident from the observation that `BiCl_(3)` even on prolonged heating with `Cl_(2)` does not form `BiCl_(5)`
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