question_answer

What is the oxidation state of Cr in \[Cr{{O}_{5}}\]?

A)  +10       

B)                         +5                         

C)         +6                         

D)         +3

Correct Answer: D

Solution :

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