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If liquefied oxygen at 1 atmospheric pre...

If liquefied oxygen at 1 atmospheric pressure is heated from 50K to 300k by supplying heat at constant rate. The graph of temperature vs time will be

A

B

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D

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The correct Answer is:
D
Liquid nitrogen boils at `-196^@C`, i.e. 77 K. So, temperature of liquid nitrogen will rise from 60 K to 77 K and then it will remain constant during the phase change and then it will again rise for gaseous nitrogen. This variation is shown in graph (d).
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MODERN PUBLICATION-THERMAL PROPERTIES OF MATTER-COMPETITION FILE (OBJECTIVE TYPE QUESTION ((A) MULTIPLE CHOICE QUESTION WITH ONLY ONE CORRECT ANSWER))
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