Question

oxidation state of Co in :- [CoCl2(en)2]SO4 ?

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Answer 1

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Let oxidation state of Co be x .

x + (-1)2 +(0)2 = 2

x - 2 = 2

x = 4

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Answer 2

Oxidation state of Co in $[CoCl_2(en)_2]SO_4$ is +4

Explanation:

A coordination complex consists of a central metal atom or ion bonded to ligands by coordinate covalent bonds. The ligands and the central metal together form the coordination sphere.

$[CoCl_2(en)_2]SO_4$

Central metal atom : Co

Coordination sphere consists of 2 chloro ligands with -1 charge , 2 ethylene diammine (en) neutral ligand .As sulphate carries a 2- charge ,the coordination sphere carries a +2 charge as the the coordination compound is electrically neutral.

Let the oxidation state of Co = x

∴ x + 2(-1)+2(0)= +2

x = +2+2 =+4

Oxidation state of Co = +4

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