Question

EAN of cobalt is 36 in $\left[Co\right(N{H}_3{)}_2{O}_2\left(en\right)Cl]$. Thus, $O_2$ is :

• A. dioxide
• B. superoxide ion
• C. peroxide ion
• D. oxide

Answer 1

The correct option is C peroxide ion

$\left[Co\right(N{H}_3{)}_2{O}_2\left(en\right)Cl]$

Atomic number of $Co=27$

O. S. of $Co$ in complex $=+3$

So,

$24+2\times 2+4+2+2\times x=36$

$x=1$

So, $O_2$ exits as peroxide ion $O_2^{2-}$