Boiling

Q.

Glycerol is separated in soap industries by;

1. Fractional distillation

2. Distillation under reduced pressure

3. Differential extraction

4. Steam distillation

Q.

Heat is absorbed during boiling.

1. True
2. False

Q.

The boiling point of a liquid is that temperature at which the vapour pressure of the liquid is

1. equal to the atmospheric pressure

2. less than the atmospheric pressure

3. greater than the atmospheric pressure

4. None of the above

Q. The molar enthalpy of vaporization of hexane $\left(C_6{H}_{14}\right)$ is $28.9kJ/mol$, and its normal boiling point is ${69}^{\circ }C$. What is the vapour pressure of hexane at ${25.00}^{\circ }C$ in $torr$? [$e^{-1.5}=0.222$]

1. $169.5torr$
2. $195.4torr$
3. $134.6torr$
4. $202.2torr$

Q.

Water boils at lower temperature on high altitudes because:

1. Atmospheric pressure is low there

2. Atmospheric pressure is high there

3. Water is weakly hydrogen bonded there

4. None of the above

Q. Boiling point of a liquid does not depend upon its intermolecular forces of attraction.

1. True
2. False

Q.

Water boils at lower temperature on high altitudes because:

1. Atmospheric pressure is low there

2. Atmospheric pressure is high there

3. Water is weakly hydrogen bonded there

4. None of the above

Q.

Define boiling point of the liquid.

Q.

Boiling of a liquid is a bulk phenomenon.

1. True
2. False

Q. When a liquid is heated in a closed container, the temperature at which boundary between gaseous and liquid phases disappears is called

1. critical temperature
2. boiling point
3. freezing point