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Q. The oxidation state of cobalt in the complex compound $[Co(NH_{3})_{6}]Cl_{3}$ is

Coordination Compounds

Solution:

$[Co(NH_{3})_{6}]Cl_{3} \to [Co(NH_{3})_{6}]^{3+} + 3Cl^{-}$
$x + 6(0) = +3 \Rightarrow x = +3.$