Q.

Liquid oxygen at 50 K is heated to 300 K at constant pressure of 1 atmosphere. The rate of heating is constant. Which of the graphs shown  in Fig. represent the variation of temperature (T) with time (t)?

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a

b

c

d

answer is C.

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Detailed Solution

At atmospheric pressure, the boiling point of liquid oxygen is greater than 50 K. Therefore, between 50K and 300 K, liquid oxygen undergoes a change of state. Hence the correct choice is (3).
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