First slide

Valence bond theory

Question

The oxidation state of Co in ${[Co {(H_{2} O)}_{5} Cl]}^{2 +}$ is

Easy

A

+2
B

+3
C

+1
D

+4

Solution

$\begin{array}{l} {[\underset{x}{Co} \underset{0}{{(H_{2} O)}_{5}} \underset{- 1}{Cl}]}^{+ 2} \\ x - 1 = 2 \Rightarrow x = + 3 \end{array}$

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