Which of the following statement(s) is/are correct? (a) The physical state of the system at crit...

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Which of the following statement(s) is/are correct?
(a) The physical state of the system at critical condition cannot be defined.
(b) All the physical properties of liquid and gaseous state of a substance become identical at critical condition.
(c) For a gas, there is no distinction between liquid and vapour state at critical condition.
(d) Easily liquefiable gases have higher Boyles temperature while the gases difficult to liquefy has lower Boyles temperature.
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