Podcast
Questions and Answers
In the complex ion $[Ni(CO)₄]$, CO acts as a:
In the complex ion $[Ni(CO)₄]$, CO acts as a:
Which of the following ligands is hexadentate?
Which of the following ligands is hexadentate?
Which of the following dissociates completely into simple ions in water?
Which of the following dissociates completely into simple ions in water?
Which of the following is the correct formula for Ammineaquadibromidocopper(II)?
Which of the following is the correct formula for Ammineaquadibromidocopper(II)?
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What is the IUPAC name of the complex $K₃[Fe(CN)₆]$?
What is the IUPAC name of the complex $K₃[Fe(CN)₆]$?
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The compound $[Co(NH₃)₆]Cl₃$ is named _____.
The compound $[Co(NH₃)₆]Cl₃$ is named _____.
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The ligand CO is called _____ in coordination chemistry.
The ligand CO is called _____ in coordination chemistry.
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The IUPAC name for the complex $[PtCl₂(NH₃)₂]$ is _____.
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 _____.
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 _____.
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.
