Question

Oxidation state of Co in [Co(NH3)4(H2O)Cl]SO4

Answer 1

Answer:

oxidation state of cobalt Co is +3

Explanation:

let the oxidation state of Co be x then

X+4(-3+3)+2(1)-2+(-1) +(-2)=0

X-3=0

X=+3

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Answer 2

Oxidation state of Co in  $[Co(NH_3)_4(H_2O)Cl]SO₄$ is +3

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.

$[Co(NH_3)_4(H_2O)Cl]SO₄$

Coordination sphere consists of four $NH_3$ neutral ligands, one $H_2O$  neutral ligand and $Cl$ with -1 charge. The coordination sphere carries a +2 charge as $SO_4$ carries a charge of -2 and as the coordination compound is electrically neutral.

Let the oxidation state of Co = x

∴ x + 4(0) +1(0) +1(-1) = +2

x-1 = +2

x= +3

Oxidation state of Co = +3

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