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NEET Sample Paper NEET Sample Test Paper-10

  • question_answer
    At \[{{25}^{o}}C\] the total pressure of an ideal solution obtained by mixing 3 moles of A and 2 moles of B is 184 torr. What is the vapour pressure (in torr) of pure B at the same temperature? (Vapour pressure of pure A at \[{{25}^{o}}C\] is\[200\text{ }torr\]).

    A)  180               

    B)  160

    C)  16                  

    D)  100

    Correct Answer: B

    Solution :

    \[P=P_{A}^{o}\left( \frac{{{n}_{A}}}{{{n}_{A}}+{{n}_{B}}} \right)+P_{B}^{o}\left( \frac{{{n}_{B}}}{{{n}_{A}}+{{n}_{B}}} \right)\] \[1\varepsilon =200\left( \frac{3}{3+2} \right)+P_{B}^{o}\left( \frac{2}{3+2} \right)\] \[184=200\times \frac{3}{5}+P_{B}^{o}\times \frac{2}{5}\] \[184=120+P_{B}^{o}\frac{2}{5}\] \[64=P_{B}^{o}\frac{2}{5}\] \[=P_{B}^{o}\frac{64\times 5}{2}=160\] torr


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