What is oxidation number of $C r$ in $[C r (O_{2})_{4}]^{3 -}$ ?

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Solution

$[C r (O_{2})_{4}]^{3 -}$
$O_{2}^{2 -}$ Ion (peroxide)
The oxidation state of the O in peroxide is $- 1$
Let oxidation state of $C r$ be $x$
$x - 4 \times 2 = - 3$
$⟹ x = + 5$
Thus oxidation state of the $C r$ will be +5.

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