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NEET Chemistry States of Matter / पदार्थ की अवस्थाएँ - गैस एवं द्रव Question Bank Self Evaluation Test - States of Matter

  • question_answer
    A mixture of Ne and Ar kept in a closed vessel at 250 K has a total \[K.E.=3kJ\]. The total mass of Ne and Ar is 30 g. Find mass % of Ne in gaseous mixture at 250 K.

    A) 61.63               

    B) 38.37

    C) 50                                

    D) 28.3

    Correct Answer: D

    Solution :

    [d] \[K=\frac{3}{2}{{n}_{T}}RT\Rightarrow {{n}_{T}}=\frac{3000\times 2}{3\times 250\times 8.314}\] \[3\times {{10}^{3}}=\frac{3}{2}{{n}_{T}}\times 8.314\times 250\] \[\frac{x}{20}+\frac{30-x}{40}=\frac{2}{8.314}\] %\[Ne=28.3\]


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