Solid States
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28 Which of the following oxides shows electrical properties like metals ?
(i) SiO2
(ii) MgO
(iii) SO2
(iv) CrO2
28 Which of the following oxides shows electrical properties like metals ?
(i) SiO2
(ii) MgO
(iii) SO2
(iv) CrO2
28. Option (iv) CrO2 is correct since it shows electrical conductivity similar to the metals.
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27. Which of the following oxides behaves as conductor or insulator depending upon temperature?
(i) TiO
(ii) SiO2
(iii) TiO3
(iv) MgO
27. Which of the following oxides behaves as conductor or insulator depending upon temperature?
(i) TiO
(ii) SiO2
(iii) TiO3
(iv) MgO
27. Option (iii) TiO3 is correct since certain metal oxides such as VO, VO2, VO3and TiO3 show either metallic or insulating properties depending upon the temperature.
Upvote 25. Which of the following is not the characteristic of ionic solids?
(i) Very low value of electrical conductivity in the molten state.
(ii) Brittle nature.
(iii) Very strong forces of interactions.
(iv) Anisotropic nature.
25. Which of the following is not the characteristic of ionic solids?
(i) Very low value of electrical conductivity in the molten state.
(ii) Brittle nature.
(iii) Very strong forces of interactions.
(iv) Anisotropic nature.
25. Option (i) Very low value of electrical conductivity in the molten state is correct since in molten state, the ionic solids possess free ions which help in the conduction of electricity. Due to the availability of these free ions the electrical conductivity of ionic compounds in molten stat
Upvote 24. Which of the following solids is not an electrical conductor?
(A) Mg (s)
(B) TiO (s)
(C) I2(s)
(D) H2O (s)
(i) (A) only
(ii) (B) Only
(iii) (C) and (D)
(iv) (B), (C) and (D)
24. Which of the following solids is not an electrical conductor?
(A) Mg (s)
(B) TiO (s)
(C) I2(s)
(D) H2O (s)
(i) (A) only
(ii) (B) Only
(iii) (C) and (D)
(iv) (B), (C) and (D)
24. Option (iii) (C) and (D) is correct since Iodine is a non-polar molecular solid which acts as an insulator while H2O is a hydrogen bonded molecular solid which also acts as an insulator. Whereas Mg is a metal and acts as a conductor in solid and in its molten state and TiO is also an i
Upvote 23. Which of the following is a network solid?
(i) SO2 (Solid)
(ii) I2
(iii) Diamond
(iv) H2O (Ice)
23. Which of the following is a network solid?
(i) SO2 (Solid)
(ii) I2
(iii) Diamond
(iv) H2O (Ice)
23. Option (iii) Diamond is correct since in diamond, the carbon atoms are held together by strong covalent bonds. It is a giant molecule. Thus, it is a solid network.
Upvote 22. Iodine molecules are held in the crystals lattice by ____________.
(i) London forces
(ii) dipole-dipole interactions
(iii) covalent bonds
(iv) coulombic forces
22. Iodine molecules are held in the crystals lattice by ____________.
(i) London forces
(ii) dipole-dipole interactions
(iii) covalent bonds
(iv) coulombic forces
22. Option (i) London forces is correct since iodine molecules are nonpolar and covalent in nature. These molecules are found to be electrically symmetrical and have no dipole moment. The molecules in a crystal lattice of iodine are thus attracted together by weak London forces.
Upvote 21. The sharp melting point of crystalline solids is due to ___________.
(i) a regular arrangement of constituent particles observed over a short distance in the crystal lattice.
(ii) a regular arrangement of constituent particles observed over a long distance in the crystal lattice.
(iii) same arrangement of constituent particles in different directions.
(iv) different arrangement of constituent particles in different directions.
21. The sharp melting point of crystalline solids is due to ___________.
(i) a regular arrangement of constituent particles observed over a short distance in the crystal lattice.
(ii) a regular arrangement of constituent particles observed over a long distance in the crystal lattice.
(iii) same arrangement of constituent particles in different directions.
(iv) different arrangement of constituent particles in different directions.
21. Option (ii) a regular arrangement of constituent particles observed over a long distance in the crystal lattice is correct since the regularity of the crystalline lattice creates local environments that are the same and hence crystals exhibit sharp melting point.
Upvote 20. Which of the following statement is not true about amorphous solids?
(i) On heating they may become crystalline at certain temperature.
(ii) They may become crystalline on keeping for long time.
(iii) Amorphous solids can be moulded by heating.
(iv) They are anisotropic in nature.
20. Which of the following statement is not true about amorphous solids?
(i) On heating they may become crystalline at certain temperature.
(ii) They may become crystalline on keeping for long time.
(iii) Amorphous solids can be moulded by heating.
(iv) They are anisotropic in nature.
20. (iv) They are anisotropic in nature since amorphous solid shows isotropic properties as they exhibit same values of the properties like refractive index, electrical resistance when measured along different directions.
Upvote 19. Which of the following is true about the value of refractive index of quartz glass?
(i) Same in all directions
(ii) Different in different directions
(iii) Cannot be measured
(iv) Always zero
19. Which of the following is true about the value of refractive index of quartz glass?
(i) Same in all directions
(ii) Different in different directions
(iii) Cannot be measured
(iv) Always zero
19. Option (i) Same in all directions is correct since quartz glass is an amorphous solid showing isotropic properties and hence exhibits the same values of refractive index when measured along different directions.
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