Boiling Point

Q.

Define Boiling Point, Melting Point, and Evaporation?

Q. What are the physical properties?

Q.

Under which of the following conditions we can boil water at the room temperature?

1. By adding any salt.

2. By increasing the pressure.

3. By adding any liquid.

4. By lowering the pressure.

Q.

The temperature at which liquid starts boiling at atmospheric pressure is known as :

1. Melting point

2. Boiling point

3. Evaporation

4. Condensation

Q. If 0 degree Celsius is converted into Kelvin scale, then it will show___K.

Q.

Due to which of the following reason perfumes are made up of volatile liquids?

1. Liquid droplets can rapidly convert to liquid and diffuse faster in air.

2. Liquid droplets can rapidly convert to gas and diffuse slowly.

3. Liquid droplets can rapidly convert to vapour and diffuse faster.

4. Liquid droplets can rapidly convert to liquid and diffuse slowly in air.

Q.

The boiling point of ethyl alcohol is 78°C . What is the corresponding temperature on kelvin scale?

Q.

Which temperature in Kelvin scale corresponds to 50°C ?

Q.

The temperature at which liquid starts boiling at atmospheric pressure is known as its ___

1. Melting point

2. Boiling point

3. Evaporation

4. Condensation

Q. What is the temperature in Kelvin scale, at which water starts boiling?

1. 0 K
2. 100 K
3. 373 K
4. 273 K

Q.

(i) State one difference and similarity between the Celsius scale and Kelvin scale.

(ii) What are the two fixed points normally used to calibrate the instrument used to measure temperature? Write its value on absolute scale.

(iii) What are STP and NTP? Write its significance.

Q.

Define Boiling Point, Melting Point and Evaporation.

Q. Why does the temperature of a substance remain constant during its melting point or boiling point?

Q.

The conversion of a substance from the liquid into the gaseous (vapour) phase is called __________________.

1. Sublimation

2. Diffusion

3. Solidification

4. Vaporisation

Q.

Boiling point is the temperature at which _________ is converted into ____________at one atmospheric pressure?

Q.

What is the temperature in Kelvin scale, at which water starts boiling?

1. $0K$

2. $100K$

3. $273K$

4. $373K$

Q.

The boiling points of Diethyl ether, Acetone and n-Butyl alcohol are ${35}^{\circ }C,{56}^{\circ }C$ and ${118}^{\circ }C$ respectively. Which one of the following correctly represents their boiling points in Kelvin scale?

1. 306 K, 329 K, 391 K

2. 308 K, 329 K, 391 K

3. 329 K, 392 K, 308 K

4. 308 K, 329 K, 392 K

Q. Assertion :Vapor in its natural state is a solid or liquid at room temperature . Reason: Gas in its natural state at room temperature would still be a gas.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Volatile liquids have ___________.

1. high boiling point
2. low viscosity
3. low boiling point
4. none of above

Q.

A body can have a temperature $-10K$.

1. True
2. False

Q. The point at which all the three phases (solid, liquid, gas) co-exist is called:

1. triple point
2. boiling point
3. none of these
4. freezing point

Q. The temperature at which water gets converted to steam is known as its .

1. boiling point
2. melting point
3. freezing point

Q.

The temperature at which the substances get converted from their liquid state to gaseous state is called as _____________.

1. Melting point

2. Freezing point

3. Boiling point

4. Vaporization point

Q.

The liquids which can change into vapours easily are termed as ______ liquids.

1. Stable liquids

2. Volatile liquids
3. Unstable liquids
4. Non-volatile liquids

Q.

The kelvin scale_______negative temperature.(has/does not have)

Q.

The boiling point of water is _______________.

Q.

The temperature at which the substances get converted from their liquid state to gaseous state is called as _____________.

1. Freezing point

2. Melting point

3. Vaporization point

4. Boiling point