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What is the coordination number of chromium in K3[Cr(C2O4)3]?

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in Chemistry – Class 12 by (188k points)
What is the coordination number of chromium in K3[Cr(C2O4)3]?

(a) 1

(b) 2

(c) 3

(d) 6

I got this question in an interview for job.

My doubt is from Definitions topic in portion Coordination Compounds of Chemistry – Class 12

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The correct answer is (d) 6

The explanation: There are three oxalate groups attached to the central ion in the given compound, but since oxalate is a didentate ligand, there are a total of 6 donor atoms to which the metal is directly bonded. Thus, the CN of Cr in K3[Cr(C2O4)3] is 6.

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