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NEET CHEMISTRYCoordination CompoundsMedium

Question

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.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Coordination Compounds. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYCoordination Compoundshypotheticalcomplexchlorodiaquatriamminecobaltiiichloriderepresented

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