Which of the following statements about latent heat for a given substance is/are correct 1. It is fixed at a given temperature 2. It depends upon temperature and volume 3. It is independent of temperature and volume 4. It depends on the temperature but independent of volume?

2
1 and 3
4 only
1 and 4

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 2 : 1 and 3

CONCEPT

Latent Heat: The amount of heat required per mass to change the state of any substance. It is a hidden form of heat.

The change in state always occurs at a constant temperature.
The SI unit of latent heat is Joule/kg

Latent heat of fusion and vaporization:

In the process of melting or vaporization, the temperature remains constant. The amount of heat needed to change the state of matter having mass m is-
Q = m L

Latent heat of fusion: It is the heat required for 1 kg of substance to change it from solid to liquid state without change of temperature.

Latent heat of fusion of ice = 3.36 × 10⁵ J/kg
In CGS = 80 cal / gm.

Latent heat of Vaporization: It is the heat required for 1 kg of substance to change it from liquid to gaseous state without change of temperature.

Latent heat of vaporization of water = 2.25 × 10⁶ J/kg.
In CGS = 536 cal / gm

EXPLANATION

The latent heat is hidden heat for change in state.

In the process of change of state temperature remains constant.

⇒ Latent heat is fixed at a given temperature, thus independent of temperature

The volume of the object while changing the state is fixed.

⇒ Latent heat is independent of volume.

∴ Statement 1and 3 are true ⇒ Option 2 is correct.

4 views Answered 2022-09-04 04:29

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