By reading the accompanying graph, determine the INCORRECT statement out of the following.

F1 Vinanti Teaching 19.01.23 D3

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CSIR-UGC (NET) Chemical Science: Held on (16 Feb 2022)
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  1. Melting point increases with pressure
  2. Melting point decreases with pressure
  3. Boiling point increases with pressure
  4. Solid, liquid and gas can co‐exist at the same pressure and temperature

Answer (Detailed Solution Below)

Option 1 : Melting point increases with pressure
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Detailed Solution

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Concept: 

The Clausius–Clapeyron relation characterizes a discontinuous phase transition between two phases of matter of a single constituent. On a pressure-temperature (P–T) diagram, the line separating the two phases is known as the coexistence curve. The Clausius–Clapeyron relation gives the slope of the tangents to this curve. The Clausius–Clapeyron relation can be used to find the relationship between pressure and temperature along the phase.

F1 Vinanti Teaching 19.01.23 D4

Explanation: 

The given phase diagram is as follows: 

F1 Vinanti Teaching 19.01.23 D3

We know that the melting point is the temperature at which liquid changes into solid or vice-versa.

As the diagram depicts by the dotted line between solid and liquid as the pressure increases the melting point is decreasing. 

Thus, based on the given diagram the statement: 'Melting point increases with pressure ', is wrong.

Hence, the correct option is (1).

Conclusion:-

So, the INCORRECT statement is Melting point increases with pressure

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