| 1 |
Which one of the following substances is not amorphous |
- A. Polymer
- B. Rubber
- C. Glass
- D. AgNO<sub>3</sub>
|
| 2 |
Ionic solids are characterized by. |
- A. Low melting points
- B. High vapour pressures
- C. Good conductivity in solid state
- D. Solubility in polar solvents
|
| 3 |
Ice float over water because. |
- A. Its structure is diamond like
- B. Its density is maximum at 4 <sup>o</sup>C
- C. It is less dense than water
- D. It has no regular arrangement of molecules.
|
| 4 |
Which of the given has hydrogen bonding. |
- A. CH4
- B. CCl4
- C. NH3
- D. NaCl
|
| 5 |
How many allotropic forms are present in carbon |
- A. Two
- B. Three
- C. Four
- D. Five
|
| 6 |
London dispersion forces 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. Molecules of solid iodine
- D. Molecules of hydrogen chloride gas
|
| 7 |
When water freezes, its volume increase. |
- A. 12%
- B. 9%
- C. 15%
- D. 18%
|
| 8 |
Molecular crystals are generally |
- A. Hard
- B. Relatively soft
- C. Unstable
- D. do not exist
|
| 9 |
Conductivity of metal decreases by increasing temperature because. |
- A. Atoms are converted to ions
- B. Atoms oscillates and hinder the movement of free electrons.
- C. Ions are converted into atoms
- D. Velocity of mobile electrons increases
|
| 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.
|