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Give the oxidation state , d-orbital occ...

Give the oxidation state , d-orbital occupation and coordination number iof the central metal ion in the following complexes :
(a) `K_(3)[Co(C_(2)O_(4))_(3)]` (b) `(NH_(4))_(2)[CoF_(4)]` (c) `Cis - [CrCl_(2)(en)_(2)]Cl` (d) `[Mn(H_(2)O)_(6)]SO_(4)`

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(a) OS = + 3, CN = 6, d-orbital occupation is `3d^(6) t_(2g)^(6) e_(g)^(0)` .
(b) OS = + 2, CN = 4, `3d^(7) (t_(2g)^(5) e_(g)^(2))` ,
(c) OS = + 3, CN = 6, `3d^(3) (t_(2g)^(3))` ,
(d) OS = + 2, CN = 6 `3d^(6) (t_(2g)^(3) e_(g)^(2))` .
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