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NEET Sample Paper NEET Sample Test Paper-79

  • question_answer
    What is the temperature of which the kinetic energy of 0.3 mole of helium is equal to the kinetic energy of 0.4 mole of argon at 400 K?

    A)  400 K              

    B)  873 K

    C)  533 K              

    D)  300 K

    Correct Answer: C

    Solution :

    \[\operatorname{Number} of moles of He = 0.3\] \[Number of moles of Ar = 0.4\] \[\operatorname{KE}\,\,of\,\,He =0.3\times R\times T\] \[\operatorname{KE}\,\,of\,\,Ar =0.4\,\,\times \,\,R\,\,\times \,\,400\] According to question, \[\operatorname{KE} \,of \,Ar \,= \,KE \,of\, Ar\] \[0.3\,\times \,R\,\times T=0.4\times R\,\times 400\] \[\operatorname{T}\,\,=\,\,\frac{0.4\times R\,\times 400}{0.3\times R}\] \[T=533\text{ }K\]


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