What is oxidation number of $C r$ in $C r O_{5} o r C r O (O_{2})_{2}$ ?

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Solution

The oxidation state of $C r$ is $+ 6$
Here there are 4 peroxide oxygen atoms with oxidation state -1 are present.
Only one oxygen is present with oxidation state -2.
Let oxidation state of the $C r$ be $x$
Thus, oxidation state of the $C r$ will be
$x + 4 (- 1) + - 2 = 0$
$x - 6 = 0$
$∴ x = + 6$

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