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12 . kinetic theory of gases — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics12 . kinetic theory of gases1 Mark
MCQ
For matter to exist simultaneously in gas and liquid phases
  • A
    The temperature must be $0 \,K$
  • B
    The temperature must be less than ${0^o}C$
  • ✓
    The temperature must be less than the critical temperature
  • D
    The temperature must be less than the reduced temperature
✓

Answer

Correct option: C.
The temperature must be less than the critical temperature
c
The following graph below illustrates a $(T-b)$ diagram of a matter.

The line $l$ corresponds to a liquid line saturated. The line $g$ corresponds to a saturated gas line:

The vegion between is the wet region (both lignid and gas). $T_{c}$ corresponds to the critical temperature.

So, it is clear that the temp must be below the critical temperature for a matler to exist simultaneously as gas and liquid.

Correct choice - option-$C$

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