NEET Sample Paper NEET Sample Test Paper-32

  • question_answer 28) The r.m.s. velocity of a gas at a certain temperature is \[\sqrt{2}\] times than that of the oxygen molecules at that temperature. The gas can be:-

    A)  \[{{H}_{2}}\]                

    B)  He

    C)  \[C{{H}_{4}}\]               

    D)  \[S{{O}_{2}}\]

    Correct Answer: C

    Solution :

    \[{{V}_{rms}}\propto \sqrt{\frac{T}{{{M}_{\infty }}}}\] \[{{V}_{rms}}=\sqrt{2}\,{{({{V}_{rms}})}_{{{O}_{2}}}}\] \[\sqrt{\frac{T}{{{M}_{\infty }}}}=\sqrt{2}\,\sqrt{\frac{T}{32}}\] \[{{M}_{w}}=16\,gm\] so gas is \[C{{H}_{4}}\]

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