Question

The oxidation number of Co in complex [Co(H$_2$NCH$_2$CHNH$_2$)$_3$]$_2$(SO$_4$)$_3$ is:

• A. 3
• B. 4
• C. 2
• D. 5

Answer 1

Answer: (B)

4

Answer 2

The oxidation state of Co is +3 as the SO$_4$ ions contribute -6 total charge, leaving the complex to balance it with a +6 charge. Each Co ion contributes +3.