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NEET Sample Paper NEET Sample Test Paper-26

  • question_answer
    A flask containing air (open to atmosphere) is heated from 300 K to 500 K. The percentage of air escaped to the atmosphere is:

    A)  \[66.6%\]                   

    B)  \[16.6%\]

    C)  \[33.3%\]                   

    D)  \[40%\]

    Correct Answer: D

    Solution :

    At 300 K W gram of air is present in the flask. \[PV=\frac{W}{m}RT\] \[PV=\frac{W}{m}R\times 300\]                ?.(i) When heated to 500 K, then air in flask = W gram             \[PV=\frac{W'}{m}R\times 500\]         ??(ii) From equations (i) and (ii)             \[\frac{W}{m}R\times 300=\frac{W'}{m}R\times 500\]                 \[W'=\frac{3W}{5}\] Amount of air escaped \[=W-W'\]                                 \[=W-\frac{3W}{5}=\frac{2W}{5}\] % of air escaped \[=\frac{2W}{5W}\times 100=40%\]


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