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General Chemistry

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Liquids, Solids, and Phase Transitions

Question
8 out of 10
 

A phase diagram illustrates the physical state of a substance with respect to the temperature and the pressure of the surroundings. The points plotted to draw the phase diagram are derived experimentally, and are usually plotted with temperature on the x-axis and pressure on the y-axis. A typical phase diagram is shown below in Figure-1.

image\27286 Ch 7.jpg


The point marked 'X' in the phase diagram given in the passage is called:

A The critical point
B The maximum point
C The triple point
D The critical pressure point

Ans. C This is a definition-type question. The point indicated by the X mark is called "triple point." At the triple point of a substance, the three phases coexist at equilibrium. Below this point, the solid to gas conversion or vice versa is direct without the intermediate liquid phase.

Liquids, Solids, and Phase Transitions Flashcard List

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