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A gaseous compound is heated at constant pressure. The figure below shows the variation of volume as the temperature is increased.

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At first, the volume increases in a steady fashion as predicted by Charles' law. Then, all of a sudden, at Point A, the volume starts to increase at a more rapid rate.

Which of the following is a possible explanation for this behavior?


Gases cease to behave ideally at elevated temperatures.


The molecules of gas have begun to dissociate.


Point A is the critical point for this substance.


A change of state is occurring.

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