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Question

In [Cr(O2)(NH3)4H2O]Cl2, oxidation number of Cr is +3, then oxygen will be in the form of:

A
dioxo
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B
peroxo
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C
superoxo
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D
oxo
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Solution

The correct option is C superoxo
Oxidation number of Cr is +3 as given. Oxidation number of NH3 and H2O is 0 as it is neutral ligand and of Cl is -1. Now we can find oxidation number of O as
(+3)+2(x)+4(0)+0+2(1)=0
2(x)=1
As we find O2 has -1 oxidation number so it is superoxo.

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