| 1 |
London dispersion force are the only forces present among the. |
- A. Molecules of water in liquid state
- B. Atoms of helium in gaseous state at high temperature
- C. Molecule of solid iodine
- D. Molecules of hydrogen chloride gas
|
| 2 |
NH3 shows a maximum boiling point among the hydrides of V-A group elements due to. |
- A. Very small size of nitrogen
- B. Lone pair of electron present on nitrogen
- C. enhanced electronegative character of nitrogen
- D. Pyramidal structure of NH3
|
| 3 |
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.
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| 4 |
A pressure cooker reduces cooking time because. |
- A. Heat is uniformly distributed
- B. Boiling point of water rises
- C. A large flame is used
- D. Vapour pressure of liquid reduces
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| 5 |
Which of the following can form H-bonds |
- A. NH<sub>3</sub>
- B. C<sub>2</sub>H<sub>6</sub>
- C. NaCI
- D. CHCI<sub>3</sub>
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| 6 |
When water freezes at 0 <sup>o</sup>C, its density decrease due to. |
- A. Cubic structure of ice
- B. Empty spaces present in the structure of ice
- C. Change of bond lengths
- D. Change of bond angles
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| 7 |
The molecule of CO2 in dry ice form the. |
- A. Ionic crystals
- B. Covalent crystals
- C. Molecular crystals
- D. Any type of crystals
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| 8 |
In triclinic unit cell |
- A. All axial lengths are equal
- B. All internals lengths and angles are equal
- C. Both axial lengths and angles are equal
- D. Both axial lengths and angles are unequal
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| 9 |
The polarizabilities of elements mostly increase down the group due to the reason that |
- A. The atomic numbers increase
- B. Number of protons increase
- C. Number of shells increase along, with increase of shielding effect
- D. The behavior of the elements remain the same
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| 10 |
In cubic and hexagonal closest packing which layer has different arrangement. |
- A. First
- B. Second
- C. Third
- D. Fourth
|