Ncert Exercises & Solutions

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

$1 . {Bi}_{2} O_{5}$
$2 . {BiF}_{5}$
$3 . {BiCl}_{5}$
$4 . {Bi}_{2} S_{5}$

Hint: Element shows its higher oxidation state with electronegative element only

Stability of + 5 oxidation state decreases top to bottom and + 3 oxidation state increases top to bottom due to inert pair effect. Meanwhile compound having + 5 oxidation state of

Bi

{BiF}_{5}

. It is due to smaller size and high electronegativity of fluorine.

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