First slide

Terms used in complex chemistry

Question

The oxidation number of Co in the complex ion ${[CoCl {({NH}_{3})}_{5}]}^{2 +}$ is:

Moderate

A

+2
B

+3
C

+4
D

+6

Solution

$\begin{array}{l} {[C o C l {(N H_{3})}_{5}]}^{2 +} \\ x + (- 1) + 5 (0) = 2 \\ x = + 3 \end{array}$

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