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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 33

  • question_answer
    The density of gas A is twice that to B. At the same temperature the molecular weight of gas B is twice that of A. The ratio of pressure of gas A and B will be:

    A) 1 : 6              

    B)        1 : 1

    C) 4 : 1

    D)        1 : 4

    Correct Answer: C

    Solution :

    [c] \[{{d}_{A}}=2{{d}_{B}};2{{M}_{A}}={{M}_{B}};\] \[\therefore ~~PM=dRT\] \[\therefore \frac{{{P}_{A}}}{{{P}_{B}}}\times \frac{{{M}_{A}}}{{{M}_{B}}}=\frac{{{d}_{A}}}{{{d}_{B}}}\times \frac{RT}{RT}\Rightarrow \frac{{{P}_{A}}}{{{P}_{B}}}\times \frac{1}{2}=2\]


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