First slide

Terms used in complex chemistry

Question

In the coordination compound $[Co {(en)}_{2} {Cl}_{2}] Cl$ (en = ethylenediamine), the coordination number and oxidation number of the central atom are, respectively:

Easy

A

4, +3
B

6, +2
C

4, +2
D

6, +3

Solution

$[Co {(en)}_{2} {Cl}_{2}] Cl$
(en) = ethylenediamine has two donor sites
(en) = 4 donor sites
$C l_{2} = 2$ donor sites
6 donor sites (so, six coordination number).
$\begin{matrix} [Co {(en)}_{2} {Cl}_{2}] Cl \\ ↓ \end{matrix}$
x + 2 (0) + (- 3) = 0 (en) Neutral ligand
x = + 3 oxidation state.

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