1.

Give the oxidation state, d-orbital occupation and coordination number of the central metal ion in the following complexes:(i) K3[Co(C2O4)3](ii) cis-[Cr(en)2Cl2]Cl(iii) (NH4)2[CoF4](iv) [Mn(H2O)6]SO4

Answer»

(i) K3[Co(C2O4)3]
The central metal ion is Co. Its coordination number is 6. The oxidation state can be given as:
x − 6 = −3 x
= + 3
The d orbital occupation for Co3+ is t2g 6eg 0.
(ii) cis-[Cr(en)2Cl2]Cl
The central metal ion is Cr. 

The coordination number is 6. The
oxidation state can be given as:
x + 2(0) + 2(−1) = +1
x − 2 = +1 x = +3
The d orbital occupation for Cr3+ is t2g 3.

(iii) (NH4)2[CoF4]
The central metal ion is Co.
The coordination number is 4.
The oxidation state can be given as:
x − 4 = −2 x
= + 2
The d orbital occupation for Co2+ is eg 4 t2g 3.

(iv) [Mn(H2O)6]SO4
The central metal ion is Mn.
The coordination number is 6. The
oxidation state can be given as: x +
0 = +2 x = +2
The d orbital occupation for Mn is t2g 3 eg 2.


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