1.

Elements of group - 15 compounds in +5 oxidation state. However, bismuth forms only one well characterised compound in +5 oxidation state. The compound is

Answer»

`Bi_(2)O_(5)`
`BiF_(5)`
`BiCl_(5)`
`Bi_(2)S_(5)`

Solution :Stability of + 5 oxidation STATE decreases top to bottem and +3 oxidation state increases top to bottom due to INERT pair EFFECT. Meanwhile compound having +5 oxidation state of Bi is `BiF_(5)`. It is due to smaller SIZE and high electronegativity of fluorine.


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