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JEE Main & Advanced JEE Main Paper (Held On 16 April 2018)

  • question_answer
    Two moles of helium are mixed with moles of hydrogen. If\[\frac{{{C}_{P}}}{{{C}_{V}}}=\frac{3}{2}\] for the mixture, then the value of n is [JEE Main 16-4-2018]

    A)  3/2                             

    B)  2

    C)  1                                

    D)  3

    Correct Answer: B

    Solution :

     For a given mixture of gases, \[({{n}_{1}}+{{n}_{2}})/(\lambda -1)={{n}_{1}}/({{Y}_{1}}-1)+{{n}_{2}}/({{Y}_{2}}-1)\] Put \[{{n}_{1}}=2,Y=3/2,{{Y}_{1}}=5/3,{{Y}_{2}}=7/5\] solving the required equation as \[(2+n)/(3/2-1)=2/(5/3-1)+n/(7/5-1)\] \[n=2\]


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