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


Bismuth commonly shows +3 oxidation state instead of +5 oxidation state due to inert pair effect (recultance of s electrons to take part in bond formation)

But fluorine has small size and high electronegativity than oxygen, chlorine and sulphur.


Therefore bismuth forms BiF5 and show +5 oxidation state.


Hence the correct option (ii).

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