Question

Find out the oxidation state of cobalt ions in the complex [Co(NH₃)₅Br]S0₄.

Answer 1

[Co(NH₃)₅Br]S0₄

In the above complex,

Oxidation state of NH₃ = 0

Oxidation state of Br = −1

Oxidation state of SO 4 = −2

Let the oxidation state of Co be x.

∴ x + 5 × 0 + 1 × (−1) + (−2) = 0

x + 0 − 1 − 2 = 0

x − 3 = 0

x = +3