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Calculate the oxidation number of Cr in...

Calculate the oxidation number of Cr in `CrO_5 .

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There are two peroxy links with oxygen bearing -1
By the normal calculation, O.N of Cr will be +10 which is never possible because ma0XImum O.N of Cr cannot be more than `6(3d^64s^1). This anomally (fallacy) is solved by solved by using the structure for calculation.
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