| 1 |
The distillation of liquid under reduced pressure is called. |
- A. Destructive distillation
- B. Vaccum distillation
- C. Simple distillation
- D. Fractional distillation
|
| 2 |
The shape of diamond crystal is. |
- A. cubic
- B. Hexagonal
- C. Tetragonal
- D. Orthorhombic
|
| 3 |
Diamond is bad conductor because. |
- A. It has a tight structure
- B. It has a high density
- C. It is transparent to light
- D. There are o free electros present in the crystal of diamond to conduct electricity.
|
| 4 |
The long chains of amino acids are coiled about one another onto a spiral by |
- A. Ionic bond
- B. Van der walls forces
- C. Hydrogen bonding
- D. Overlapping of orbitals
|
| 5 |
Ionic solids are characterized by. |
- A. Low melting points
- B. High vapour pressures
- C. Good conductivity in solid state
- D. Solubility in polar solvents
|
| 6 |
NH3 shows a maximum boiling point among the hydrides of the group V elements due to. |
- A. Very small size of nitrogen
- B. Long pair of electrons present on nitrogen
- C. Enhanced electronegative character of nitrogen
- D. Pyramidal structure of NH3
|
| 7 |
Which has greater enthalpy of vaporization |
- A. F2
- B. Cl2
- C. Br2
- D. I2
|
| 8 |
Crystal to diamond is. |
- A. Ionic
- B. Molecular
- C. Covalent
- D. Metallic
|
| 9 |
The distillation of a solution under reduced pressure is called |
- A. Fractional distillation
- B. Destructive distillation
- C. Distillation
- D. Vacuum distillation
|
| 10 |
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
|