In which of the following is oxidation number fractional?

B_{4} O_{10}

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B_{2} O_{3}

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C_{5} O_{2}

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K O_{3}

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Solution

The correct options are
C $C_{5} O_{2}$
D $K O_{3}$
The oxidation number is fractional in $C_{5} O_{2}$ and $K O_{3}$ respectively.
(A) Let X be the oxidation number of B in $B_{4} O_{10}$ .
$4 X + 10 (- 2) = 0$
$4 X = 20$
$X = + 5$
(B) Let X be the oxidation number of B in $B_{2} O_{3}$
$2 X + 3 (- 2) = 0$
$2 x = 6$
$X = + 3$
(C) Let X be the oxidation number of C in $C_{5} O_{2}$
$5 X + 2 (- 2)$
$5 X = 4$
$X = \frac{4}{5}$
(D) Let X be the oxidation number of O in $K O_{3}$
$+ 1 + 3 X$
$X = \frac{- 1}{3}$

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