First slide
Oxidation number
Question

 In acidic mediumH2O2 changes Cr2O72- to CrO5 which has  two (-O-O-) bonds.Oxidation state of Cr in CrO5 is 

Moderate
Solution

CrO5has butterfly structure having two peroxo bonds

Peroxo oxygen has -1 oxidation state.

Let oxidation state of Cr be “X”

CrO5:x+4(-1)+1(-2)=0x=+6

 

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