| 1 |
In order to mention the oiling point of water at 110 <sup>o</sup>C, the external pressure should be. |
- A. Between 760 torr and 1200 torr
- B. Between 200 torr and 760 torr
- C. 765 torr
- D. Any value of pressure
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| 2 |
NH3 shows a maximum boiling point among the hydrides of the group V elements due to. |
- A. Very small size of nitrogen
- B. Long pair of electrons present on nitrogen
- C. Enhanced electronegative character of nitrogen
- D. Pyramidal structure of NH3
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| 3 |
Which of the following elements in its crystalline form will have the lowest enthalpy change of vaporization |
- A. Chlorine
- B. Argon
- C. Phosphorus
- D. Silicon
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| 4 |
Molecular crystals are generally |
- A. Hard
- B. Relatively soft
- C. Unstable
- D. do not exist
|
| 5 |
The nature of copper crystals is |
- A. Metallic
- B. Ionic
- C. Covalent
- D. Molecular
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| 6 |
Ionic solid are characterized by. |
- A. Low melting point
- B. Good conductivity in solid state
- C. High vapours pressure
- D. solubility in polar solvent
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| 7 |
Which of the following is psuedo solid |
- A. CaF2
- B. Glass
- C. NaCl
- D. All
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| 8 |
When water freezes, its volume increase. |
- A. 12%
- B. 9%
- C. 15%
- D. 18%
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| 9 |
Vapour pressure of a substance does not depend upon. |
- A. Temperature
- B. Intermolecular forces
- C. Surface area
- D. Physical state of water
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| 10 |
Amorphous solids. |
- A. Have sharp melting points.
- B. Undergo clean cleavage when cut with knife
- C. Have perfect arrangement of atoms
- D. Can possesses small regions of orderly arrangement of atoms.
|