Question

The oxidation number of $Co$ in the complex ion $[CoCl(N{H}_3{)}_5{]}^{2+}$ is:

• A. +2
• B. $+3$
• C. $+4$
• D. +6E

Answer 1

Answer: (B)

$[CoCl(N{H}_3{)}_5{]}^{2+}$
$x+(-1)+5(0)=2$
$x=+3$