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Q. Oxidation number of Cr in $ Cr{{O}_{5}} $ is

Rajasthan PETRajasthan PET 2011

Solution:

The structure of
$ Cr{{O}_{5}} $ is as
Let the oxidation number of Cr is $ x $
$ x+1(-2)+4(-1)=0 $
$ x-2-4=0 $
$ x=+6 $

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