Practicing mcq on solid state is one of the most effective ways to understand Class 12 Chemistry Chapter 1. The solid state chapter explains important concepts such as crystalline and amorphous solids, unit cells, crystal lattices, packing efficiency, and defects in solids. Students preparing for board exams or competitive tests like NEET often revise this chapter through multiple-choice questions. Solving MCQs helps you test your conceptual clarity, improve speed, and identify common mistakes. In this article, you will find carefully selected MCQ on solid state with four options and answers, designed to help you revise important topics quickly and strengthen your exam preparation effectively.
MCQ on Solid State (Class 12 Chemistry Chapter 1)
1. Which of the following is an example of a crystalline solid?
A. Glass
B. Rubber
C. Sodium chloride
D. Plastic
Answer: C. Sodium chloride
2. Which of the following is an amorphous solid?
A. Diamond
B. Quartz
C. Glass
D. Sodium chloride
Answer: C. Glass
3. In crystalline solids, particles are arranged in:
A. Random order
B. Long-range order
C. No order
D. Liquid form
Answer: B. Long-range order
4. Which property is characteristic of crystalline solids?
A. Irregular shape
B. Sharp melting point
C. Random arrangement
D. Low density
Answer: B. Sharp melting point
5. The smallest repeating unit in a crystal lattice is called:
A. Atom
B. Molecule
C. Unit cell
D. Void
Answer: C. Unit cell
6. The number of atoms in a simple cubic unit cell is:
A. 1
B. 2
C. 3
D. 4
Answer: A. 1
7. The number of atoms in a body-centered cubic (BCC) unit cell is:
A. 1
B. 2
C. 3
D. 4
Answer: B. 2
8. The number of atoms in a face-centered cubic (FCC) unit cell is:
A. 2
B. 3
C. 4
D. 6
Answer: C. 4
9. Packing efficiency of a simple cubic unit cell is approximately:
A. 52%
B. 68%
C. 74%
D. 90%
Answer: A. 52%
10. Packing efficiency of body-centered cubic structure is:
A. 52%
B. 68%
C. 74%
D. 80%
Answer: B. 68%
11. Packing efficiency of face-centered cubic structure is:
A. 52%
B. 60%
C. 68%
D. 74%
Answer: D. 74%
12. Coordination number of simple cubic structure is:
A. 4
B. 6
C. 8
D. 12
Answer: B. 6
13. Coordination number of BCC structure is:
A. 6
B. 8
C. 12
D. 4
Answer: B. 8
14. Coordination number of FCC structure is:
A. 4
B. 6
C. 8
D. 12
Answer: D. 12
15. Which solid has the highest melting point?
A. Ionic solids
B. Metallic solids
C. Covalent solids
D. Molecular solids
Answer: C. Covalent solids
16. Diamond is an example of:
A. Ionic solid
B. Molecular solid
C. Covalent solid
D. Metallic solid
Answer: C. Covalent solid
17. Which solid conducts electricity in molten state?
A. Ionic solid
B. Molecular solid
C. Covalent solid
D. Amorphous solid
Answer: A. Ionic solid
18. Which of the following is a metallic solid?
A. Sodium
B. Ice
C. Diamond
D. Sulphur
Answer: A. Sodium
19. Which of the following has the lowest melting point?
A. Ionic solids
B. Molecular solids
C. Covalent solids
D. Metallic solids
Answer: B. Molecular solids
20. The empty spaces in crystal structures are called:
A. Cells
B. Nodes
C. Voids
D. Edges
Answer: C. Voids
21. Number of tetrahedral voids in FCC structure is:
A. Equal to atoms
B. Twice the atoms
C. Half the atoms
D. Four times the atoms
Answer: B. Twice the atoms
22. Number of octahedral voids in FCC structure is:
A. Equal to atoms
B. Twice the atoms
C. Half the atoms
D. Four times the atoms
Answer: A. Equal to atoms
23. Missing ions in ionic crystal cause:
A. Frenkel defect
B. Schottky defect
C. Impurity defect
D. Metal excess defect
Answer: B. Schottky defect
24. In Frenkel defect, ions:
A. Leave crystal
B. Occupy interstitial position
C. Form molecules
D. Break bonds
Answer: B. Occupy interstitial position
25. Schottky defect decreases:
A. Density
B. Volume
C. Temperature
D. Energy
Answer: A. Density
26. Frenkel defect is common in:
A. Ionic solids with small cation
B. Large ions
C. Molecular solids
D. Covalent solids
Answer: A. Ionic solids with small cation
27. Which defect does not change density?
A. Frenkel defect
B. Schottky defect
C. Vacancy defect
D. Impurity defect
Answer: A. Frenkel defect
28. Silicon is an example of:
A. Conductor
B. Semiconductor
C. Insulator
D. Superconductor
Answer: B. Semiconductor
29. Doping increases:
A. Density
B. Conductivity
C. Melting point
D. Mass
Answer: B. Conductivity
30. n-type semiconductor is formed by doping with:
A. Pentavalent impurity
B. Trivalent impurity
C. Divalent impurity
D. Monovalent impurity
Answer: A. Pentavalent impurity
31. p-type semiconductor is formed by doping with:
A. Pentavalent impurity
B. Trivalent impurity
C. Divalent impurity
D. Noble gas
Answer: B. Trivalent impurity
32. The formula for density of unit cell is:
A. ZM/a³NA
B. a³/ZM
C. Z/a³
D. M/a³
Answer: A. ZM/a³NA
33. Which solid is soft and has low melting point?
A. Molecular solid
B. Ionic solid
C. Metallic solid
D. Covalent solid
Answer: A. Molecular solid
34. Ice is an example of:
A. Ionic solid
B. Molecular solid
C. Metallic solid
D. Covalent solid
Answer: B. Molecular solid
35. Graphite is an example of:
A. Covalent solid
B. Molecular solid
C. Metallic solid
D. Ionic solid
Answer: A. Covalent solid
36. Graphite conducts electricity because:
A. Free electrons
B. Ionic bonds
C. Metallic bonding
D. Molecular structure
Answer: A. Free electrons
37. Which of the following is diamagnetic?
A. NaCl
B. O₂
C. Fe
D. Ni
Answer: A. NaCl
38. Paramagnetic substances contain:
A. Paired electrons
B. Unpaired electrons
C. No electrons
D. Only protons
Answer: B. Unpaired electrons
39. Ferromagnetic substances include:
A. Iron
B. Sodium chloride
C. Water
D. Ice
Answer: A. Iron
40. Amorphous solids are also called:
A. Supercooled liquids
B. True solids
C. Perfect solids
D. Ideal solids
Answer: A. Supercooled liquids
41. Which of the following is not a crystalline solid?
A. Quartz
B. NaCl
C. Glass
D. Diamond
Answer: C. Glass
42. The edge length of cubic unit cell is represented by:
A. r
B. a
C. d
D. Z
Answer: B. a
43. Relationship between edge length and radius in simple cubic is:
A. a = 2r
B. a = 4r
C. a = √2r
D. a = √3r
Answer: A. a = 2r
44. Relationship between edge length and radius in BCC is:
A. a = 4r/√3
B. a = 2r
C. a = 4r
D. a = √2r
Answer: A. a = 4r/√3
45. Relationship between edge length and radius in FCC is:
A. a = 4r/√2
B. a = 2r
C. a = 4r
D. a = √3r
Answer: A. a = 4r/√2
46. The total number of Bravais lattices is:
A. 7
B. 14
C. 12
D. 10
Answer: B. 14
47. The total number of crystal systems is:
A. 7
B. 14
C. 6
D. 12
Answer: A. 7
48. Which solid has directional bonding?
A. Ionic solid
B. Covalent solid
C. Metallic solid
D. Molecular solid
Answer: B. Covalent solid
49. Which solid is brittle?
A. Ionic solid
B. Metallic solid
C. Covalent solid
D. Molecular solid
Answer: A. Ionic solid
50. Metallic solids conduct electricity due to:
A. Free electrons
B. Protons
C. Neutrons
D. Molecules
Answer: A. Free electrons
51. Which crystal structure has highest packing efficiency?
A. Simple cubic
B. BCC
C. FCC
D. Tetragonal
Answer: C. FCC
52. Close packed structure includes:
A. FCC and HCP
B. Simple cubic
C. BCC
D. Orthorhombic
Answer: A. FCC and HCP
53. Which of the following is an example of ionic crystal?
A. NaCl
B. Diamond
C. Graphite
D. Ice
Answer: A. NaCl
54. Which solid shows anisotropic properties?
A. Crystalline solid
B. Amorphous solid
C. Liquid
D. Gas
Answer: A. Crystalline solid
55. Amorphous solids show:
A. Isotropic properties
B. Anisotropic properties
C. No properties
D. Metallic properties
Answer: A. Isotropic properties
56. In a simple cubic lattice, atoms touch along:
A. Edge
B. Face diagonal
C. Body diagonal
D. Corner
Answer: A. Edge
57. In BCC lattice, atoms touch along:
A. Edge
B. Face diagonal
C. Body diagonal
D. Corner
Answer: C. Body diagonal
58. In FCC lattice, atoms touch along:
A. Edge
B. Face diagonal
C. Body diagonal
D. Corner
Answer: B. Face diagonal
59. Which solid has highest hardness?
A. Diamond
B. Ice
C. Sodium
D. Sulphur
Answer: A. Diamond
60. Which of the following is a semiconductor element?
A. Silicon
B. Sodium
C. Copper
D. Iron
Answer: A. Silicon
Wrapping Up
The solid state chapter is an important part of Class 12 Chemistry and builds your understanding of how particles are arranged in solids. Concepts such as crystal lattices, unit cells, packing efficiency, defects, and electrical properties are frequently asked in exams. Practicing mcq on solid state helps you revise these topics quickly and test your conceptual understanding. Multiple-choice questions also help you remember important formulas and definitions more effectively. By solving MCQs regularly, you can improve your speed and accuracy while preparing for exams. Consistent practice of mcq on solid state will strengthen your preparation and help you score better in board and competitive exams.
