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The sum of coordination number and oxidation number of the metal M in the complex [M(en)2(C2O4)]Cl (where en is ethylenediamine) is:

1. 9
2. 6
3. 7
4. 8

Correct answer: 9

Solution

The coordination number of M is 6 (4 from two bidentate en ligands and 2 from the bidentate oxalate ligand). The oxidation number of M is +3, as the complex is neutral overall and Cl contributes -1. Thus, the sum is 6 + 3 = 9.

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