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NEET CHEMISTRYMedium

The hypothetical complex chlorodiaquatriamminecobalt(III) chloride can be represented as:

A

[CoCl(NH3)3(H2O)2]Cl2[CoCl(NH_3)_3(H_2O)_2]Cl_2

B

[Co(NH3)3(H2O)Cl3][Co(NH_3)_3(H_2O)Cl_3]

C

[Co(NH2)3(H2O)2Cl][Co(NH_2)_3(H_2O)_2Cl]

D

[Co(NH3)3(H2O)3Cl3][Co(NH_3)_3(H_2O)_3Cl_3]

Step-by-Step Solution

Let us deduce the formula from the given IUPAC name 'chlorodiaquatriamminecobalt(III) chloride':

  1. Central metal: Cobalt (Co) in +3 oxidation state.
  2. Ligands in the coordination sphere (alphabetical order in name):
  • 'chloro' indicates one Cl−Cl^- ligand.
  • 'diaqua' indicates two H2OH_2O ligands.
  • 'triammine' indicates three NH3NH_3 ligands. So, the coordination entity is [CoCl(NH3)3(H2O)2][CoCl(NH_3)_3(H_2O)_2].
  1. Charge on the coordination sphere: x=(+3)+(−1)+2(0)+3(0)=+2x = (+3) + (-1) + 2(0) + 3(0) = +2.
  2. Counter ion: 'chloride' indicates Cl−Cl^- outside the coordination sphere.
  3. To balance the +2 charge of the complex cation, two chloride ions are required outside the bracket. Therefore, the complete formula is [CoCl(NH3)3(H2O)2]Cl2[CoCl(NH_3)_3(H_2O)_2]Cl_2.
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