KVPY Sample Paper KVPY Stream-SX Model Paper-31

  • question_answer
    6.0 g of urea (molecular weight = 60) was dissolved in 9.9 moles of water. If the vapour pressure of pure water is \[{{P}^{o}},\] the vapour pressure of solution is -

    A) \[0.10\,\,{{P}^{o}}\]

    B) \[1.10\,\,{{P}^{o}}\]

    C) \[0.90\,\,{{P}^{o}}\]

    D) \[0.99\,\,{{P}^{o}}\]

    Correct Answer: D

    Solution :

    \[\frac{P{}^\circ -P}{P{}^\circ }={{x}_{solute}}\] or \[\,\frac{P{}^\circ -P}{P{}^\circ }=\frac{n}{n+N}\]\[\Rightarrow \frac{0.1}{0.1+9.9}\]\[\Rightarrow 0.01;\,\,P=0.99\,\,P{}^\circ \]


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