| 1 |
Molecular crystals are generally |
- A. Hard
- B. Relatively soft
- C. Unstable
- D. do not exist
|
| 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 |
Vapour pressure of a substance does not depend upon. |
- A. Temperature
- B. Intermolecular forces
- C. Surface area
- D. Physical state of water
|
| 5 |
The molecules of CO<sub>2</sub>in dry ice form the |
- A. Ionic crystal
- B. Covalent crystals
- C. Molecular crystals
- D. Any type of crystals
|
| 6 |
Diamond is a bad conductor of electricity because |
- A. It has a tight structure
- B. It has a high density
- C. There are no free electrons present in the crystal of diamond to conduct electronics
- D. None of these
|
| 7 |
In which , case particles are separated from each other. |
- A. Fusion
- B. Condensation
- C. Neutralizations
- D. Vaporization
|
| 8 |
On which factor boiling point of a liquid depends. |
- A. Amount of the liquid
- B. Shape of the container of the liquid
- C. Type of burner used for boiling
- D. External pressure
|
| 9 |
The number of Na, ions which surround each CI<sup>1-</sup>ion the NaCI crystal lattice is |
|
| 10 |
One of the following liquids has lowest vapour pressure at 32°C. Indicate that liquid |
- A. Ether
- B. Chloroform
- C. Ethanol
- D. Water
|