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Variable Valency

[CoF6]3- is a...

Question

$[C o F_{6}]^{3 -}$ is a coordination complex ion.
What is the oxidation number of cobalt in the complex?

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Solution

$[C o F_{6}]^{3 -}$
$x + (6 \times - 1) = - 3$
$∴$ Oxidation number of Co, $x = + 3$

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