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AMU Medical AMU Solved Paper-2009

  • question_answer
    Critical temperature of \[{{H}_{2}}O,\,N{{H}_{3}}C{{O}_{2}}\] and \[{{O}_{2}}\] are 647 K, 405.6 K, 304.10 K and 154.2 K respectively. If the cooling starts from 500 K to their critical temperature, the gas that liquefies first is

    A)  \[{{H}_{2}}O\]                                 

    B)  \[N{{H}_{3}}\]

    C)  \[C{{O}_{2}}\]                                  

    D)  \[{{O}_{2}}\]

    Correct Answer: B

    Solution :

                     The gases for which critical temperature is high, have strong forces of attraction and thus, can be liquefied easily. Among the given gases, \[{{H}_{2}}O\] has the highest critical temperature, ie, 647 K but cooling starts from 500 K, so it is not considered. Critical temperature of \[N{{H}_{3}}\] ranks second, thus it will liquify first.


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