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Q.

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

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a

+3

b

+4

c

+2

d

+1

answer is B.

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Detailed 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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