Group-15 elements can form compounds in +5 oxidation state. However, Bi forms only one well characterized compound in +5 oxidation state. This compound is

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BiCl5

Bi2S5

BiF5

Bi2O5

answer is C.

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Detailed Solution

The only compound formed by Bi in +5 oxidation state is BiF5. It is due to smaller size and high electronegativity of B-atom.

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