Physical Chemistry - Solid State

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Q1. Which type of crystal system has the highest symmetry? (2022)

Solution:

The cubic crystal system has the highest symmetry among all crystal systems.

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Q2. What is the main characteristic of a molecular solid? (2021)

Solution:

Molecular solids generally have low melting points due to weak intermolecular forces.

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Q3. Which of the following properties is characteristic of ionic solids? (2021)

Solution:

Ionic solids are typically brittle due to the strong electrostatic forces between the ions, which cause them to shatter when force is applied.

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Q4. In a crystal lattice, the arrangement of particles is determined by which of the following? (2019)

Solution:

The arrangement of particles in a crystal lattice is primarily determined by intermolecular forces, which dictate how particles pack together.

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Q5. In a simple cubic lattice, how many atoms are present in one unit cell? (2019)

Solution:

In a simple cubic lattice, there is 1 atom per unit cell (1/8 atom from each of the 8 corners).

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Q6. Which of the following properties is characteristic of covalent network solids? (2019)

Solution:

Covalent network solids are typically brittle due to the strong covalent bonds that do not allow for easy deformation.

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Q7. In a body-centered cubic (BCC) structure, how many atoms are there in one unit cell? (2022)

Solution:

In a body-centered cubic (BCC) structure, there are 2 atoms per unit cell (1 from the center and 1 from the corners).

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Q8. What is the primary force holding together the atoms in metallic solids? (2020)

Solution:

Metallic solids are held together by metallic bonds, which involve a 'sea of electrons' that are free to move.

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Q9. What is the effect of temperature on the solubility of most solid solutes in liquids? (2022)

Solution:

For most solid solutes, solubility in liquids increases with temperature due to increased kinetic energy of the molecules.

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Q10. Which of the following is NOT a property of metals? (2021)

Solution:

Brittleness is not a property of metals; they are typically malleable and ductile.