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1. What are coordination compounds?
Ans. Coordination compounds are complexes formed by the combination of a central metal ion and ligands. Ligands are molecules or ions that donate electron pairs to the metal ion, forming coordinate bonds. These compounds exhibit unique properties and are widely used in various fields, including medicine, industry, and catalysis.
2. How are coordination compounds named?
Ans. Coordination compounds are named using a specific nomenclature system called the IUPAC (International Union of Pure and Applied Chemistry) system. In this system, the ligands are named first, followed by the name of the central metal ion. The oxidation state of the metal ion is indicated using Roman numerals in parentheses. For example, [Fe(CN)₆]³⁻ is named hexacyanidoferrate(III).
3. What is the coordination number of a coordination compound?
Ans. The coordination number of a coordination compound refers to the number of coordinate bonds formed between the central metal ion and the ligands. It represents the total number of ligands attached to the metal ion. The coordination number can vary from 2 to as high as 12, depending on the type of metal and ligands involved.
4. How do coordination compounds exhibit isomerism?
Ans. Coordination compounds can exhibit different types of isomerism, including geometric isomerism and optical isomerism. Geometric isomerism arises when the ligands can be arranged in different spatial orientations around the central metal ion, resulting in different geometric structures. Optical isomerism occurs when the compound has a chiral center, leading to the existence of enantiomers that are non-superimposable mirror images of each other.
5. What are the applications of coordination compounds?
Ans. Coordination compounds find wide applications in various fields. Some of the important applications include: - Medicinal applications: Coordination compounds are used as anticancer drugs, antibiotics, and for targeted drug delivery. - Industrial applications: They are used as catalysts in chemical reactions, especially in the production of polymers and pharmaceuticals. - Biological and environmental applications: Coordination compounds are used as sensors, imaging agents, and in water treatment processes. - Coordination compounds also find applications in electroplating, dyes, pigments, and as materials for electronic devices.
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