Solids Quiz - CBSE Class 12 Chemistry

Free practice quiz: Solids (CBSE Class 12 Chemistry). 12 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following is NOT a characteristic of a crystalline solid?

   1. Definite geometrical shape
   2. Sharp melting point
   3. Isotropic nature
   4. Ordered arrangement of constituent particles
   Show answer

   Answer: C. Isotropic nature

   Crystalline solids have a definite geometrical shape, sharp melting point, and an ordered arrangement of constituent particles. Isotropy (having the same properties in all directions) is characteristic of amorphous solids, not crystalline solids.

2. Explain the difference between crystalline and amorphous solids.

   1. Crystalline solids have a definite geometrical shape, while amorphous solids do not.
   2. Crystalline solids have a sharp melting point, while amorphous solids have a range of melting points.
   3. Crystalline solids have an ordered arrangement of constituent particles, while amorphous solids do not.
   4. All of the above.
   Show answer

   Answer: D. All of the above.

   Crystalline solids exhibit long-range order in their atomic arrangements, leading to a definite geometrical shape and sharp melting point. Amorphous solids lack this long-range order and thus show no definite shape and a gradual melting range.

3. Describe the structure of graphite and explain its properties based on its structure.

   1. Graphite consists of hexagonal layers of carbon atoms, leading to its slippery nature and high electrical conductivity.
   2. Graphite is a giant covalent structure with strong covalent bonds within layers and weak van der Waals forces between layers.
   3. Both A and B are correct.
   4. Neither A nor B is correct.
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   Answer: C. Both A and B are correct.

   Graphite's layered structure with strong covalent bonds within layers and weak van der Waals forces between layers accounts for its softness (layers can slide over each other easily) and good electrical conductivity (delocalized electrons within the layers).

4. Explain the concept of packing efficiency in solids and its significance.

   1. The percentage of space occupied by constituent particles in a unit cell. It determines the density and other physical properties of solids.
   2. The ratio of volume occupied by constituent particles to total volume of the unit cell.
   3. Both A and B are correct.
   4. Neither A nor B is correct.
   Show answer

   Answer: C. Both A and B are correct.

   Packing efficiency is a measure of how closely atoms are packed in a crystal lattice. Higher packing efficiency leads to higher density and influences other physical properties.

5. What is the difference between a vacancy and an interstitial defect in a crystal lattice?

   1. A vacancy is an empty lattice site, while an interstitial defect is an extra atom occupying an interstitial site.
   2. Vacancies reduce the density of the crystal while interstitial defects increase the density.
   3. Both A and B are correct.
   4. Neither A nor B is correct.
   Show answer

   Answer: C. Both A and B are correct.

   Vacancies are missing atoms from lattice sites, decreasing density; interstitials are extra atoms in spaces between lattice sites, increasing density.

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