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Give the oxidation state, d-orbitals occupation and coordination number of the central metal ion in the following complexes:
(i). `K_3[Co(C_2O_4)_3]`
(ii). `cis-[Cr(en)_2Cl_2]Cl`
(iii). `(NH_4)_2[CoF_4]`
(iv). `[Mn(H_2O)]SO_4`

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