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What is a phase diagram?
A) A graph of the physical state of the substance (solid, liquid or gas) and the temperature and pressure of the substance.
B) A graph of the physical state of the substance (solid, liquid or gas) and the temperature and state of the substance.
C) A graph of the physical state of the substance (solid, liquid or gas) and the reactant and product of the substance.
D) A diagram showing the phases of a liquid.
E) A diagram showing the phases of a gas.

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Last updated date: 13th Jun 2024
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Answer
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Hint: The answer here is based on the concept of physical chemistry and the definition of phase diagram which is based on all the phases and this fact gives the correct answer.

Complete step by step solution:
We have come across phrases like phase diagrams, states of matter and several properties regarding the states of matter that are solid, liquid and gas.

Now, let us try to understand the base of a phase diagram which leads us to the correct answer.
-Phase diagram as the name itself states it is the diagram of different phases which relates their pressures in the form of a diagram plotted against temperature.
- Thus phase diagrams can also be defined as ‘It is the chart which shows the conditions like pressure, temperature etc.) at which the thermodynamically distinct phases occur and which coexist at equilibrium.
- There are several types of phase diagrams that include 2 dimensional, 3 dimensional and crystal forms.
- The labels on the phase diagram graphs represent the stable states of the system in equilibrium.
- Phase diagram is plotted where pressure is taken on X – axis and temperature is taken on the Y – axis.
So, the correct answer is “Option A”.

Note: Here important thing to be noted is that the phase diagram not only relates with temperature and pressure but also with that of volume at distinct phases of the states of matter.