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  4. The oxidation number of chromium in CrO5 is

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Q. The oxidation number of chromium in $ CrO_5 $ is

UPSEEUPSEE 2010Redox Reactions

Solution:

$CrO _{5}$ has following structure :

image

Thus, $Cr O _{4} \cdot O$

$x+(-1) \times 4+(-2)=0$

due to peroxide linkage

$x - 4 - 2 = 0$

$\therefore =+6$