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Which of the following is true about the Latent heat? a. It is an amount of heat absorbed by a unit mass of the substance to change its state. b. Temperature changes due to absorption of heat. c. S.I. unit of Latent heat is Joules per kilogram. d. Latent heat is used up in overcoming the force of attraction between the molecules of the substance.

Which of the following is true about the Latent heat? a. It is an amount of heat absorbed by a unit mass of the substance to change its state. b. Temperature changes due to absorption of heat. c. S.I. unit of Latent heat is Joules per kilogram. d. Latent heat is used up in overcoming the force of attraction between the molecules of the substance. Correct Answer a, c and d

The correct answer is option 3 i.e a, c and d.

Concept:

  • Latent Heat is an amount of heat absorbed by a unit mass of the substance to change its state without change of temperature. Hence statement 'a' is correct and the statement 'b' is wrong. 
  • The S.I. unit of Latent heat is Joules per kilogram. Hence statement 'c' is correct. 
  • Latent heat is used up in overcoming the force of attraction between the molecules of the substance. Hence statement 'd' is correct. 
  • For e.g - Latent heat of fusion and latent heat of vaporization involved in phase changes, i.e. a substance condensing or vaporizing at a specified temperature and pressure.

Additional Information

  • Latent heat of vaporization: It is the heat energy required to change 1 kg of the material in its liquid state at its boiling point to 1 kg of the material in its gaseous state.
    • It is also the amount of heat energy released when 1 kg of vapour changes into 1 kg of liquid.
  • Latent heat of fusion: It is the heat energy required to change 1 kg of the material in its solid state at its melting point to 1 kg of the material in its liquid state.
    • It is also the amount of heat energy released when at melting point 1 kg of liquid changes to 1 kg of solid.

Related Questions

In this question, the first and last sentences of the passage are numbered 1 and 6. The rest of the passage is split into four parts and named P, Q, R, and S. These four parts are not given in their proper order. Read the sentence and find out which of the four combinations is correct. S1: A force exists between everybody in the universe. P: Normally it is very small but when one of the bodies is a planet, like earth, the force is considerable. Q: It has been investigated by many scientists including Galileo and Newton. R: Everything on or near the surface of the earth is attracted by the mass of the earth. S: This gravitational force depends on the mass of the bodies involved. S6: The greater the mass, the greater is the earth's force of attraction on it. We can call this force of attraction gravity. The Proper sequence should be:
S1:A force of exists between everybody in the universe.
P :Normally it is very small but when the one of the bodies is a planet, like earth, the force is considerable.
Q :It has been investigated by many scientists including Galileo and Newton.
R :Everything on or near the surface of the earth is attracted by the mass of earth.
S :This gravitational force depends on the mass of the bodies involved.
S6:The greater the mass, the greater is the earth's force of attraction on it. We can call this force of attraction gravity.

The Proper sequence should be:
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