1.

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

Answer»

`Bi_(2)O_(5)`
`BiF_(3)`
`BiCl_(5)`
`Bi_(2)S_(5)`

SOLUTION :The stability of +5 oxidation state decreases down the group due to inert pair effect. The only well CHARACTERISED Bi(V) COMPOUND is `BiF_(5)` as fluorine being most electronegative element is able to unpair NS ELECTRONS.


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