Question

What is the oxidation state of $Co$ in $[Co(H_{2}O)_{5}Cl]^{2+}?$

• A. 2
• B. 3
• C. 1
• D. 4

Answer 1

Answer: (B)

3

Answer 2

The correct answer is B:3
The oxidation state of H2O is 0, and that of Cl is -1. The overall charge on the compound is +2.
$x+(5\times 0)+(-1)=+2$
$x=+3$