Question

The co-ordination number and the oxidation state of the element 'M' in the complex $\left[M\right(en{)}_2\left(C_2{O}_4\right)]N{O}_2$ $\{$where (en) ethane -$1,2$- diamine $\}$ are respectively.

• A. $6$ and $3$
• B. $6$ and $2$
• C. $4$ and $3$
• D. $4$ and $2$

Answer 1

The correct option is A $6$ and $3$

The co-ordination number and the oxidation state of the element 'M' in the complex $\left[M\right(en{)}_2\left(C_2{O}_4\right)]N{O}_2$ are 6 and 3 respectively.
Three bidentate ligands surround metal 'M'. Hence, the coordination number is 6. The oxidation numbers of ligands $en$, $C_2{O}_4$ and $N{O}_2$ re 0, -2 and -1 respectively. Hence, the oxidation number of element 'M will be $0-(2\times 0-2-1)=0-(-3)=+3$.