NEET Exam > NEET Videos > Chemistry Class 11 > VSEPR Theory
VSEPR Theory Video Lecture | Chemistry Class 11 - NEET
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FAQs on VSEPR Theory Video Lecture - Chemistry Class 11 - NEET
| 1. What is VSEPR theory? |  |
Ans. VSEPR theory, or Valence Shell Electron Pair Repulsion theory, is a model used in chemistry to predict the shape of molecules based on the arrangement of electron pairs around the central atom. It states that electron pairs in the valence shell of an atom repel each other and try to minimize their repulsion by adopting a specific molecular geometry.
| 2. How does VSEPR theory determine the shape of a molecule? | |
Ans. VSEPR theory determines the shape of a molecule by considering the number of electron pairs (both bonding and non-bonding) around the central atom. It follows the principle that electron pairs repel each other and try to position themselves as far apart as possible. By considering the number of electron pairs, VSEPR theory predicts the molecular geometry, which is the arrangement of atoms in a molecule.
| 3. What are the different molecular geometries predicted by VSEPR theory? | |
Ans. VSEPR theory predicts several molecular geometries, including linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral. These geometries depend on the number of electron pairs around the central atom. For example, a molecule with two electron pairs will have a linear geometry, while a molecule with four electron pairs will have a tetrahedral geometry.
| 4. How does VSEPR theory explain the polarity of molecules? | |
Ans. VSEPR theory can explain the polarity of molecules by considering the molecular geometry and the electronegativity of the atoms involved. If a molecule has polar bonds (bonds with a significant difference in electronegativity), the overall molecular polarity depends on the arrangement of these polar bonds. In some cases, the molecular geometry may result in a nonpolar molecule despite having polar bonds, while in other cases, the molecular geometry may enhance the overall polarity of the molecule.
| 5. Can VSEPR theory accurately predict the shape of all molecules? | |
Ans. VSEPR theory provides a good approximation for the shape of many molecules, especially those with a central atom surrounded by small atoms or lone pairs of electrons. However, there are instances where VSEPR theory may not accurately predict the shape, particularly in cases involving transition metals or larger atoms. In such cases, other factors such as hybridization and molecular orbital theory may need to be considered to obtain a more accurate description of the molecule's shape.
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Dec 22, 2024 Last updated |
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