Question

What is the oxidation state of cr in (Cr(PPh3)(Co)5)+2

Answer 1

The oxidation state of Cr in $[Cr(PPh_3)(CO)_5]^{2+}$ is +2

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.

$[Cr(PPh_3)(CO)_5]^{2+}$

Coordination sphere consists of  5 carbonyl neutral ligands and 1 tripheenyl phosphine neutral ligands .The coordination sphere carries a +2 charge.

Let the oxidation state of Cr = x

Oxidation state of $PPh_3$  = 0    

Oxidation state of $CO$  = 0    

∴ x +5(0)+ 1(0)= +2

x = +2

Oxidation state of Co = +2

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