Question

Given below are two statements :
Statement I : [Co(NH₃)₆] ³⁺ is a homoleptic complex whereas [Co(NH₃)4Cl₂] ⁺ is a heteroleptic complex. 
Statement II : Complex [Co(NH₃)₆] ³⁺ has only one kind of ligands but [Co(NH₃)₄Cl₂] ⁺ has more than one kind of ligands. 
In the light of the above statements, choose the correct answer from the options given below

• A. Both Statement I and Statement II are true
• B. Both Statement I and Statement II are false
• C. Statement I is true but Statement II is false
• D. Statement I is false but Statement II is true

Answer 1

The Correct Option is A

To understand the statements, first, let's establish key definitions in coordination chemistry:

• Homoleptic Complex: A complex where the central metal ion is bonded to only one species of ligand.
• Heteroleptic Complex: A complex where the central metal ion is bonded to more than one species of ligand.

Next, let's assess the provided cobalt complexes:

• Statement I Evaluation:
  The complex [Co(NH₃)₆]³⁺ features six ammine (NH₃) ligands, all of a single type, classifying it as homoleptic. In contrast, [Co(NH₃)₄Cl₂]⁺ contains both ammine (NH₃) and chloride (Cl^-) ligands, designating it as heteroleptic. Consequently, Statement I is accurate.
• Statement II Evaluation: 
  The complex [Co(NH₃)₆]³⁺ exclusively possesses one ligand type (NH₃), confirming the statement. The complex [Co(NH₃)₄Cl₂]⁺, however, comprises two ligand types: NH₃ and Cl^-. Therefore, Statement II is also accurate.

The definitive conclusion is: Both Statement I and Statement II are accurate.