Questions
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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Correct option is C
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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A student takes 50gm wax (specific heat = 0.6 kcal/kgoC) and heats it till it boils. The graph between temperature and time is as follows. Heat supplied to the wax per minute and boiling point are, respectively
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