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NCERT Class XII Chemistry
Chapter - Coordination Compounds
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Question : 23 of 43
Marks: +1, -0
Give the oxidation state, d-orbital occupation and coordination numberof the central metal ion in the following complexes :
(i) K3[Co(C2O4)3]\mathrm{K}_3[\mathrm{Co}(\mathrm{C}_2\mathrm{O}_4)_3]
(ii) cis−[Cr(en)2Cl2]Cl\mathrm{cis-}[\mathrm{Cr}(\mathrm{en})_2\mathrm{Cl}_2]\mathrm{Cl}
(iii) (NH4)2[CoF4]\mathrm{(NH_4)_2[CoF_4]}
(iv) [Mn(H2O)6]SO4\mathrm{[Mn(H_2O)_6]SO_4}
Solution:  
(i) K3[Co(C2O4)3]−O.S.=+3,\mathrm{K}_3[\mathrm{Co}(\mathrm{C}_2\mathrm{O}_4)_3] - \text{O.S.} = + 3,
C.N.=6,  3d6configuration=t2g6eg0\text{C.N.} = 6,\;3d^{6}\text{configuration} = t_{2 g}^{6} e_{g}^{0}
(ii) cis−[Cr(en)2Cl2]Cl−O.S.=+3,\mathrm{cis-}[\mathrm{Cr}(\mathrm{en})_2\mathrm{Cl}_2]\mathrm{Cl} - \text{O.S.} = + 3,
C.N.=6,  d3configuration=t2g3\text{C.N.} = 6,\;d^{3}\text{configuration} = t^{3}_{2 g}
(iii) (NH4)2[CoF4]−O.S.=+2,\mathrm{(NH_4)_2[CoF_4]} - \text{O.S.} = + 2,
C.N.=4,  d7configuration=t2g5eg2\text{C.N.} = 4,\;d^{7}\text{configuration} = t^{5}_{2 g} e_{g}^{2}
(iv) [Mn(H2O)6]SO4−O.S.=+2,\mathrm{[Mn(H_2O)_6]SO_4} - \text{O.S.} = + 2,
C.N.=6,  d5configuration=t2g3eg2\text{C.N.} = 6,\;d^{5}\text{configuration} = t_{2 g}^{3} e_{g}^{2}
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