Question

The oxidation state of central atom in the complex $\left[Co{\left(N{H}_3\right)}_{4}ClN{O}_2\right]$ is

• A. +2
• B. +3
• C. +1
• D. zero.

Answer 1

Answer: (A)

Let the oxidation state of $Co$ be $x$.

$\left[Co{\left(N{H}_3\right)}_{4}ClN{O}_2\right]:x+4\times 0+1\times (-1)+1\times (-1)=0$

$x-2=0\Rightarrow x=+2$