Question

What is the oxidation state of Cr in $Cr{{O}_{5}}$ ?

• A. 10
• B. 5
• C. 6
• D. 3

Answer 1

Answer: (C)

6

Answer 2

$Cr{{O}_{5}}$ has the following structure:
Hence, oxidation state of chromium can be calculated as: $x+4\,(-1)+1\,(-\,2)=0$ (peroxide-o-atoms) or $x-4-2=0$ $x=+\,6$