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Primitive & Centred: Unit Cell Video Lecture | Chemistry for JEE Main & Advanced
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FAQs on Primitive & Centred: Unit Cell Video Lecture - Chemistry for JEE Main & Advanced
| 1. What is a unit cell in the context of crystal structures? |  |
Ans. A unit cell is the smallest repeating unit of a crystal lattice. It is a parallelepiped with edges defined by the crystallographic axes and angles between them.
| 2. What is the difference between a primitive unit cell and a centered unit cell? | |
Ans. In a primitive unit cell, the lattice points are only located at the corners of the unit cell. In a centered unit cell, there are additional lattice points located at the center of the faces or the body center of the unit cell.
| 3. How does the choice of unit cell affect the density of a crystal? | |
Ans. The choice of unit cell does not affect the density of a crystal because the density is an intrinsic property of the material. However, the unit cell volume determines the number of atoms or ions present in the unit cell, which can be used to calculate the density.
| 4. Can a crystal structure have multiple types of unit cells? | |
Ans. No, a crystal structure can only have one type of unit cell. However, there can be different ways to describe the same crystal structure using different unit cells, such as primitive or centered unit cells.
| 5. How can the choice of unit cell affect the symmetry of a crystal? | |
Ans. The choice of unit cell can affect the symmetry of a crystal by changing the symmetry elements present in the crystal lattice. Different unit cells may exhibit different types and numbers of symmetry elements, leading to different symmetry properties of the crystal.
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