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Coordination Compounds question

2002 · Q107
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Coordination Compounds question

2002 · Q107

NEETChemistryCoordination CompoundsMCQ+4 / −1
The hypothetical complex chloro diaquatriammine cobalt(III) chloride can be represented as
  1. A
    [CoCl(NH3)3(H2O)2]Cl2
  2. B
    [Co(NH3)3(H2O)Cl3]
  3. C
    [Co(NH2)3(H2O)2Cl]
  4. D
    [Co(NH3)3(H2O)3]Cl3
View written solutionFree

Correct answer: A

The hypothetical complex "chloro diaquatriammine cobalt(III) chloride" can be broken down as follows :

  • "chloro" indicates the presence of a chloride ion (Cl⁻) as a ligand.
  • "diaqua" indicates the presence of two water molecules (H₂O) as ligands.
  • "triammine" indicates the presence of three ammonia molecules (NH₃) as ligands.
  • "cobalt(III)" indicates that cobalt is in the +3 oxidation state.
  • The additional "chloride" at the end suggests the presence of chloride ions outside the coordination sphere, likely as counterions.

Given this, let's analyze the options :

  • Option A - [CoCl(NH₃)₃(H₂O)₂]Cl₂ : This matches the description. It has one chloro ligand, three ammonia ligands, two water ligands, and two chloride ions as counterions, with cobalt in the +3 oxidation state.
  • Option B - [Co(NH₃)₃(H₂O)Cl₃] : Incorrect, as it suggests three chloride ligands inside the coordination sphere, which is not specified in the name.
  • Option C - [Co(NH₂)₃(H₂O)₂Cl] : Incorrect, as NH₂ is not the same as NH₃ (ammonia), and it also suggests a different ligand arrangement.
  • Option D - [Co(NH₃)₃(H₂O)₃]Cl₃ : Incorrect, as it has three water molecules instead of two and lacks the chloro ligand inside the coordination sphere.

Therefore, the correct representation is Option A - [CoCl(NH₃)₃(H₂O)₂]Cl₂.

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