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  4. Liquid oxygen at 50 K is heated to 300 K at constant pressure of 1 atm. The rate of heating is constant. Which one of the following graphs represents the variation of temperature with time?

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Q. Liquid oxygen at $50\,K$ is heated to $300\,K$ at constant pressure of $1\,atm$. The rate of heating is constant. Which one of the following graphs represents the variation of temperature with time?

AIPMTAIPMT 2012Thermal Properties of Matter

Solution:

Temperature of liquid oxygen will first increase in the same phase. Then, the liquid oxygen will change to gaseous phase during which temperature will remain constant. After that temperature of oxygen in gaseous state will increase. Hence option (a) represents corresponding temperature-time graph.