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Solution


Q.

The oxidation state of Cr in CrO5 is                [2019, 2014]
1 – 6  
2 + 12  
3 + 6  
4 + 4  

Ans.

(3)

CrO5 has 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)=0⇒x=+6