Question

the oxidation no. of CO in [CO(C2O4)3]³- is
a. +2 b. -2 c. +3 c. -3

Answer 1

Answer:

-2 is the oxidation of co in above reaction

Answer 2

The oxidation number of cobalt in the complex is +3

Explanation:

A coordination complex contains ligands that are bonded to the central metal atom or ion to form coordinate covalent bond. The ligands and the central metal together form the coordination sphere.

The given coordination complex is:  $[Co(C_2O_4)_3]^{-3}$

Central metal atom is  Cobalt (Co)

Coordination sphere consists of 3 oxalate ligands that carry -2 charge. So, the coordination sphere will carry -1 charge as the the coordination compound is electrically neutral.

Let the oxidation state of Co be 'x'

Oxidation state of $C_2O4^{2-}$ ligands = -12

Evaluating the oxidation state of cobalt , we get:

$\Rightarrow x+3(-2)=-3\\\\\Rightarrow x=+3$

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