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Question


The phase diagram for a pure substance is shown above. Use this diagram and your knowledge about changes of phase to answer the following questions.

If the triple point pressure of a substance is greater than 1atm, we expect:

261784_1e1d21a1e5104a49aec937432db5ac80.png

A
the solid to sublime without melting
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B
the boiling point temperature to be lower than the tripple point temperature
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C
the melting point of the solid to come at a lower temperature than the tripple point
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D
that the substance cannot exist as a liquid
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Solution

The correct option is A the solid to sublime without melting

If the triple point pressure is greater than 1 atm, then the solid will not change from solid phase to liquid phase. It would instead change directly from solid to gaseous phase, as can be observed from the graph.
514859_261784_ans.gif

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