| 1 |
When external pressure is 23.7 torr, boiling point of water is |
- A. 100 <sup>o</sup>C
- B. 200<sup>o</sup>C
- C. 98<sup>o</sup>C
- D. 25<sup>o</sup>C
|
| 2 |
Which one of the following inter molecular forces are present in neon gas molecules. |
- A. Hydrogen bond
- B. dipole -Dipole attraction
- C. London dispersion force
- D. Hydrogen bonding and London dispersion force
|
| 3 |
The repulsion of electronic clouds of the molecules are responsible for the attractive forces among the molecules. These forces are |
- A. Dipole-induced dipole forces
- B. Ion-dipole forces
- C. Instantaneous dipole-induced dipole forces
- D. Dipole-dipole forces
|
| 4 |
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.
|
| 5 |
Which pair of compound are isomorphic in nature. |
- A. NaCl and KNO3
- B. KNO3 and MgO
- C. MgO and NaF
- D. CaF and CaCO3
|
| 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
|
| 7 |
Which of the following is psuedo solid |
- A. CaF2
- B. Glass
- C. NaCl
- D. All
|
| 8 |
When water freezes, its volume increase. |
- A. 12%
- B. 9%
- C. 15%
- D. 18%
|
| 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 |
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
|