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 the temperature and volume.
- 3. It is independent of temperature and volume.
- 4. It depends on the temperature but independent of volume.
Select the correct answer using the code given below :
2
1 and 3
4 only
1 and 4
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC NDA-1 – 2018
– Statement 1 accurately reflects that for a specific phase transition at standard conditions, the latent heat value is constant at the transition temperature.
– While the phase change occurs *at* a constant temperature, the *value* of the latent heat can technically vary with the pressure, which in turn affects the transition temperature. Statement 4 might be interpreting “depends on the temperature” as being specific to the transition temperature value, and “independent of volume” in the sense that the volume of the substance isn’t a variable determining the latent heat value itself, unlike say, specific heat capacity which can be defined at constant volume.