Melting Point

Q.

Choose the correct answer from the following. The conversion of ice into water is an example of _____.

1. melting

2. freezing

3. condensation

4. sublimation

Q.

Why does the temperature remain constant during Freezing?

Q. 20g of hot water at 30^°C is mixed with 10g of ice at 0^°C then temperature of mixture is 1. 20^°C 2. 15^°C 3. 5^°C 4. 0^°C

Q.

Differentiate between melting and melting point

Q.

The melting points of the three liquids are $280K$, $320K$, and $360K$. The order of intermolecular forces of attraction between these three liquids A, B, C are in the order:

B$>$C$>$A.

Label the boiling points for each liquid.

Q. Which of the following material will have the least empty space between its molecules?

1. Oxygen
2. Iron
3. Chalk
4. Oil

Q.

Fusion is a process in which a liquid on cooling changes into a solid.

1. True
2. False

Q.

Define the following terms:

(d) Freezing

Q.

The inter-molecular forces are maximum in case of

1. Copper

2. Water

3. Glycerine

4. Hydrogen.

Q. The melting point of the solid state of a substance is ${40}^{\circ }C$. The freezing point of the liquid state of the same substance will be:

1. equal to ${40}^{\circ }C$
2. more than ${40}^{\circ }C$
3. less than ${40}^{\circ }C$
4. always ${100}^{\circ }C$

Q.

With increase in intermolecular force of attraction, melting point of solid _____ .

1. decreases abruptly
2. first decreases and then increases
3. decreases gradually
4. increases

Q.

The melting point of the solid state of a substance is ${40}^{\circ }C$. The freezing point of the liquid state of the same substance will be:

1. ${40}^{\circ }C$

2. ${35}^{\circ }C$

3. ${45}^{\circ }C$

4. It depends upon the nature of the substance

Q. What happens with the temperature during the process of melting?

1. Temperature remains constant.
2. Temperature decreases.
3. Temperature suddenly decreases to zero degree celsius.
4. Temperature increases.

Q.

Which of the following has the strongest inter-particle force at the room temperature?

1. Nitrogen

2. Chalk

3. Iron

4. Mercury

Q.

The temperature at which a given material changes from a solid to a liquid is defined as__________.

1. melting point

2. boiling point

3. freezing point

4. evaporation point

Q.

Which of the following has the strongest inter-particle force at the room temperature?

1. Nitrogen

2. Mercury

3. Iron

4. Chalk

Q.

The phase transition in which a liquid turns into a solid, when its temperature is lowered below its freezing point, is called as _________.

1. Solidification

2. Melting

3. Sublimation

4. Evaporation

Q.

Melting point of a solid is an indication of the strength of the force of attraction between its particles.

1. True

2. False

Q.

In the given figure below, the appropriate terms A, B and C respectively are:

1. A - Freezing , B - Vaporization, C - Solidification

2. A - Sublimation, B - Solidification, C - Vaporization

3. A - Diffusion, B - Sublimation, C - Vaporization

4. A - Vaporization, B - Solidification, C - Sublimation