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  4. Liquid oxygen at 50 K is heated to 300 K at a constant pressure of 1 atm . The rate of heating is constant. Among the following graphs that represent the variation of temperature with time is

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Q. Liquid oxygen at $50 \, K$ is heated to $300 \, K$ at a constant pressure of $1 \, atm$ . The rate of heating is constant. Among the following graphs that represent the variation of temperature with time is

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Solution:

For some range of rise in temperature of liquid oxygen it will remain in the same phase. Then, its phase change ( liquid to gas) will take place. During the phase change, the temperature will remain constant. After that temperature of oxygen in gaseous state will further increase.