Class 12 Chemistry The Solid State MCQs with Answers

Class 12 Chemistry MCQs are very important for students who want to score good marks in their CBSE HBSE RBSE board examination. These Chemistry MCQs are also helpful for students preparing for NEET/JEE exams. Students who can Practice CBSE Class 12 Chemistry Multiple Choice Questions with Answers to improve your score in all Chemistry competitive and Board Exam

Class 12 The Solid State MCQs with Answers

Q1. Which of the following is true about the value of refractive index of quartz glass?

1. Same in all directions.
2. Different in different directions.
3. Cannot be measured.
4. Always zero.

Q2. Which of the following defects is also known as dislocation defect?

1. Frenkel defect.
2. Schottky defect.
3. Non-stoichiometric defect.
4. Simple interstitial defect.

Q3. Which of the following is not true about the ionic solids?

1. Bigger ions form the close packed structure.
2. Smaller ions occupy either the tetrahedral or the octahedral voids depending upon their size.
3. Occupation of all the voids is not necessary.
4. The fraction of octahedral or tetrahedral voids occupied depends upon the radii of the ions occupying the
   voids.

Q4. Which of the following is not true about the voids formed in 3 dimensional hexagonal close packed structure?

1. A tetrahedral void is formed when a sphere of the second layer is present above triangular void in the first
   layer.
2. All the triangular voids are not covered by the spheres of the second layer.
3. Tetrahedral voids are formed when the triangular voids in the second layer lie above the triangular voids in
   the first layer and the triangular shapes of these voids do not overlap.
4. Octahedral voids are formed when the triangular voids in the second layer exactly overlap with similar voids
   in the first layer.

Q5. Under the influence of electric field, which of the following statements is true about the movement of electrons
and holes in a p-type semi conductor?

1. Electron will move towards the positvely charged plate through electron holes.
2. Holes will appear to be moving towards the negatively charged plate.
3. Both electrons and holes appear to move towards the positively charged plate.
4. Movement of electrons is not related to the movement of holes.

Q6. Which of the following point defects are shown by AgBr(s) crystals?

1. Schottky defect.
2. Frenkel defect.
3. Metal excess defect.
4. Metal deficiency defect.

1. (A) and (B).
2. (C) and (D).
3. (A) and (C).
4. (B) and (D).

Q7. Iodine molecules are held in the crystals lattice by __.

1. London forces.
2. Dipole-dipole interactions.
3. Covalent bonds.
4. Coulombic forces

Q8.

Q9. Which of the following statements are true about metals?

1. Valence band overlaps with conduction band.
2. The gap between valence band and conduction band is negligible.
3. The gap between valence band and conduction band cannot be determined.
4. Valence band may remain partially filled.

Q10. Which of the following features are not shown by quartz glass?

1. This is a crystalline solid.
2. Refractive index is same in all the directions.
3. This has definite heat of fusion.
4. This is also called super cooled liquid.

Q11. Which of the following statement is not true about the hexagonal close packing?

1. The coordination number is 12.
2. It has 74% packing efficiency.
3. Tetrahedral voids of the second layer are covered by the spheres of the third layer.
4. In this arrangement spheres of the fourth layer are exactly aligned with those of the first layer.

Q12. Which kind of defects are introduced by doping?

1. Dislocation defect.
2. Schottky defect.
3. Frenkel defects.
4. Electronic defects.

Q13. In the cubic close packing, the unit cell has __.

1. 4 Tetrahedral voids each of which is shared by four adjacent unit cells.
2. 4 Tetrahedral voids within the unit cell.
3. 8 Tetrahedral voids each of the which is shared by four adjacent unit cells.
4. 8 Tetrahedral voids within the unit cells.

Q14. An excess of potassium ions makes KCl crystals appear violet or lilac in colour since __.

1. Some of the anionic sites are occupied by an unpaired electron.
2. Some of the anionic sites are occupied by a pair of electrons.
3. There are vacancies at some anionic sites.
4. F-centres are created which impart colour to the crystals

Q15. Which of the following statement is not true about amorphous solids?

1. On heating they may become crystalline at certain temperature.
2. They may become crystalline on keeping for long time.
3. Amorphous solids can be moulded by heating.
4. They are anisotropic in nature.

Q16. A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field becuase
__.

1. All the domains get oriented in the direction of magnetic field.
2. All the domains get oriented in the direction opposite to the direction of magnetic field.
3. Domains get oriented randomly.
4. Domains are not affected by magnetic field.

Q17. The sharp melting point of crystalline solids is due to _.

1. A regular arrangement of constituent particles observed over a short distance in the crystal lattice.
2. A regular arrangement of constituent particles observed over a long distance in the crystal lattice.
3. Same arrangement of constituent particles in different directions.
4. Different arrangement of constituent particles in different directions.

Q18. What is the coordination number in a square close packed structure in two dimensions?

1. 2
2. 3
3. 4
4. 6

Q19. Which of the following is true about the charge acquired by p-type semiconductors?

1. Positive.
2. Neutral.
3. Negative.
4. Depends on concentration of p impurity.

Q20. Which of the following is not the characteristic of ionic solids?

1. Very low value of electrical conductivity in the molten state.
2. Brittle nature.
3. Very strong forces of interactions.
4. Anisotropic nature.

Q21. The total number of tetrahedral voids in the face centred unit cell is __.

1. 6
2. 8
3. 10
4. 12

Q22. Cations are present in the interstitial sites in __.

1. Frenkel defect.
2. Schottky defect.
3. Vacancy defect.
4. Metal deficiency defect.

Q23. Which of the following conditions favours the existence of a substance in the solid state?

1. High temperature.
2. Low temperature.
3. High thermal energy.
4. Weak cohesive forces.

Q24. Which of the following is an amorphous solid?

1. Graphite (C).
2. Quartz glass (SiO ).
3. Chrome alum.
4. Silicon carbide (SiC).

Q25. The process of converting alkyl halides into alcohols involves___________.

1. Addition reaction.
2. Substitution reaction.
3. Dehydrohalogenation reaction.
4. Rearrangement reaction.

Q26. Frenkel defect is also known as __.

1. Stoichiometric defect.
2. Dislocation defect.
3. Impurity defect.
4. Non-stoichiometric defect.