| 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 |
NH<sub>3</sub>shows a maximum boiling point among the hydrides of V-A group elements due to |
- A. Very small size of nitrogen
- B. Lone pair electrons present on Nitrogen
- C. Enhanced electronegative character of Nitrogen
- D. Pyramidla structure of NH<sub>3</sub>
|
| 3 |
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
|
| 4 |
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
|
| 5 |
NaCI is face centered cubic structure. The Na ion at the face of the unit cell is shared by |
- A. 2-unit cells
- B. 4-unit cells
- C. Only one unit cell
- D. 8-unit cells
|
| 6 |
Long chains of amino acids are coiled about one another into a spiral by |
- A. Covalent bond
- B. Ionic bond
- C. Hydrogen bond
- D. Van Der Waal's forces
|
| 7 |
Diamond is a bad conductor because. |
- A. It has tight structure.
- B. It has a high density
- C. There is no free electron present in the crystal of diamond to conduct electricity
- D. None of the above
|
| 8 |
Boiling point of a liquid is high when |
- A. There is no hydrogen bonding
- B. Dipole moment is zero
- C. Inter molecular forces are weak
- D. Hydrogen bonding is present
|
| 9 |
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
|
| 10 |
Dipole-dipole forces are present among. |
- A. Molecules of Iodine
- B. Atoms of Neon i gaseous state
- C. Chloroforms' molecules
- D. CCl4 molecules
|