Questions and Answers
In the complex ion $[Ni(CO)₄]$, CO acts as a:
Which of the following ligands is hexadentate?
Which of the following dissociates completely into simple ions in water?
Which of the following is the correct formula for Ammineaquadibromidocopper(II)?
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What is the IUPAC name of the complex $K₃[Fe(CN)₆]$?
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The compound $[Co(NH₃)₆]Cl₃$ is named _____.
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The ligand CO is called _____ in coordination chemistry.
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The IUPAC name for the complex $[PtCl₂(NH₃)₂]$ is _____.
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A ligand that can donate four pairs of electrons to a metal ion is called _____.
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In the complex $[Ni(CO)₄]$, the oxidation number of Ni is _____.
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Study Notes
Coordination Chemistry Concepts
- Secondary Valence: Refers to the number of ligands bound to a central metal ion in a coordination complex, as seen in [Co(NH₃)₆]Cl₃ with possible values of 3, 6, 9, or 12.
- Oxidation State: The oxidation number of iron in [Fe(CN)₆]³⁻ is critical for understanding complex formation, with choices being +2, +3, -3, or -6.
- Coordination Number: Indicates how many ligand atoms are directly attached to the central metal. For cobalt in [Co(en)₃]³⁺, potential values are 3, 6, 8, or 9.
Ligands and Their Types
- Ligand Types: In [Ni(CO)₄], carbon monoxide (CO) acts as a monodentate ligand, binding through a single pair of electrons.
- Hexadentate Ligand: EDTA is an example of a ligand that can coordinate through six sites, while others such as en (ethylenediamine) and NH₃ (ammonia) have fewer coordination sites.
Chemical Nomenclature
- Primary Valence: In coordination complexes like [Co(NH₃)₆]Cl₃, primary valence relates to the oxidation state of the metal ion, with possible values of 0, 1, 3, or 6.
- Ambidentate Ligands: Certain ligands, for instance, NO₂⁻ and Cl⁻, can bind to the metal at different sites, enabling them to be considered ambidentate.
Stability and Solubility
- Dissociation in Water: Identifying complexes that dissociate completely into simple ions in water is important for understanding solubility, with options including K₄[Fe(CN)₆] and others.
IUPAC Naming and Complex Formulas
- Correct Formula Representation: For the complex compound of ammonium (Ammineaquadibromidocopper(II)), multiple representations exist, reflecting the arrangement of ligands and central metal.
- IUPAC Naming: The nomenclature for K₃[Fe(CN)₆] can include designations like potassium hexacyanidoferrate(II) based on its structural components.
- Naming of Complexes: [Co(NH₃)₆]Cl₃ is commonly referred to as a specific coordination complex reflecting its ligands and metal, while the ligand CO is recognized as a strong field ligand.
Electron Donation and Oxidation States
- Ligand Electron Donation: Ligands that can donate multiple electron pairs, such as tetradentate ligands, are vital to metal-ligand coordination chemistry.
- Oxidation States: Understanding the oxidation number of metals in complexes like [Ni(CO)₄] informs the geometry and stability of the resulting compound.
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Description
This mini test is designed for 12th class students, covering topics from sections 5.1 and 5.2. Students have 15 minutes to complete the questions for a total of 15 marks. Take this opportunity to assess your understanding of the material.
