Question

Specify the oxidation number of the metal in the following coordination entity:

[Co(H₂O)(CN)(en)₂]²⁺

Specify the oxidation number of the metal in the following coordination entity:

[Co(CN)(H₂O)(en)₂]²⁺

Answer 1

Let the oxidation number of the cobalt be x.

Hence, x + 0 + (−1) + (2 × 0) = +2

x = 2 + 1

∴ x = +3