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The pressure -temperature (P-T) phase di...

The pressure -temperature `(P-T)` phase diagram shown below corresponds to the
a. Curve of fusion of solids that expand on solidification.
b. Curve of sublimation of solides that directly go over to the vapour phase.

A

curve of fusion of solids that expand on solidification

B

curve of sublimation of solids that directly go over to the vapour phase

C

curve of fusion of solids that contract on solidification

D

curve of fusion of solids that do not change in volume upon solidification

Text Solution

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The correct Answer is:
C
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Each phase of a material can exits only in certain regions of pressure and temperature . P-T phase diagrams, in which pressure is plotted versus temperature, show the regions corresponding to various phases and phase transformations . P-V diagrams, on the other hand , can be used to study pressure volume relationship at a constant temperature. If the liquid and gaseous phases of a pure substances are heated together in a closed container, both the temperature and the vapor pressure will increase until a point is reached at which the two phases can no longer be distinguished from one another. The temperature and pressure at which this occurs are called the critical temperature and pressure. Exceeding either of these parameters, by itself ,will cause the "gas"//"liguid" phase transition to disappear. if the other variable is then changed as well, while the first variable is maintained above its critical point , a gradual transition will occur between the gaseous and liquid phases, with no clear boundary.(The liquid and solid phases, on the other hand , maintain a distinct boundary at all pressure above the triple point). Shown in figure is a combined P-T phase diagram for material A and B . If heat is added to solids A and B , each in a container that is open to the atmosphere :-

Each phase of a material can exits only in certain regions of pressure and temperature . P-T phase diagrams, in which pressure is plotted versus temperature, show the regions corresponding to various phases and phase transformations . P-V diagrams, on the other hand , can be used to study pressure volume relationship at a constant temperature. If the liquid and gaseous phases of a pure substances are heated together in a closed container, both the temperature and the vapor pressure will increase until a point is reached at which the two phases can no longer be distinguished from one another. The temperature and pressure at which this occurs are called the critical temperature and pressure. Exceeding either of these parameters, by itself ,will cause the "gas"//"liguid" phase transition to disappear. if the other variable is then changed as well, while the first variable is maintained above its critical point , a gradual transition will occur between the gaseous and liquid phases, with no clear boundary.(The liquid and solid phases, on the other hand , maintain a distinct boundary at all pressure above the triple point). Shown in figure is a combined P-T phase diagram for material A and B . Which is true about the substance in figure?

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OP TANDON-MISCELLANEOUS (TOPICS OF GENERAL INTEREST)-SET-VI: Problems on graphical aptitude
  1. In the pressure-volume diagram given below, the isochoric, isothermal,...

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  2. Heat energy absorbed by a system in going through a cyclic process sho...

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  3. The pressure -temperature (P-T) phase diagram shown below corresponds ...

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  4. Graph for specific heat at constant volume for a monoatomic gas

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  5. A cyclic process ABCD is shown in the P-V diagram. Which of the follow...

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  6. A system is taken from state A to B through three different paths 1,2 ...

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  7. In the cyclic process shown in P-V diagram the magnitude of work done ...

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  8. A cyclic process is shown in the p-T diagram. Which of the curves show...

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  9. Heat is supplied to a certain homogeneous sample of matter, at a unifo...

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  10. An ideal gas is taken from the state A (pressure P, volume V) to the s...

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  11. The radioactive nucleus of an element X decays to a stable nucleus of ...

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  12. In photoelectric effect the slope of straight line graph between stopp...

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  13. The stopping potential as a function of the frequency of the incident ...

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  14. Which of the following is the graph between the frequency (v) of the i...

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  15. Which of the following figure represents the variation of particle mom...

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  16. The follwing diagram indicates the energy levels of a certain atom whe...

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  17. The maximu kinetic energy (E(k)) of the photoelectron varies with freq...

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  18. The following graphs illustrate:

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  19. In the following graph:

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  20. The variation of ^^(m) of acetic acid with concentration is correctly ...

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