State whether the following statement is true or false:

The latent heat of vapourisation will become zero when the temperature or pressure equals zero.

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True

False

answer is A.

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Detailed Solution

:
The given statement is true.
Concept: The amount of heat a substance needs to change its condition is known as latent heat. Latent heat of fusion and latent heat of evaporation are two examples of latent heat.
The heat needed to transform a substance from solid to liquid or the heat released when a substance transforms from liquid to solid is known as latent heat of fusion.
The heat needed to transform a material from liquid to vapour or the heat released as it transforms from vapour to liquid is known as the latent heat of evaporation.
The source of the latent heat is

H = mL

Here, H stands for heat.
The mass is mm.
The latent heat L.
When the temperature or pressure reaches a specific level, referred to as the critical temperature or pressure, the latent heat is zero. The critical point is where two states may coexist simultaneously and latent heat vanishes.
As a result, at the critical point, the latent heat is zero.
Hence, the given statement is true.

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