Single Choice

The sum of coordination number and oxidation number of the metal $$M$$ in the complex $$[M(en)_2(C_2O_4)]Cl$$ (where en is ethylenediamine) is:

A$$7$$
B$$8$$
C$$9$$
Correct Answer
D$$6$$

Solution

The sum of coordination number and oxidation number of the metal M in the complex $$[M(en)_2(C_2O_4)]Cl$$ (where en is ethylenediamine) is 9. The coordination number is 6 as $$en$$ and $$C_2O_4$$ are bidentate ligands.

Let $$X$$ be the oxidation number of $$M$$.

$$X+2(0) -2 = +1$$

$$X=+3$$

Thus, the oxidation number is $$3$$.

Hence, the sum of coordination number and oxidation number of the metal M is $$6+3=9$$.

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