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NEET Sample Paper NEET Sample Test Paper-76

  • question_answer
    What will be the value of relative lowering of vapour pressure when 3 g urea is dissolved in 45 g. of water?

    A)  0.05                

    B)  0.04                 

    C)  0.02                            

    D)  0.01

    Correct Answer: C

    Solution :

    \[{{n}_{B}}=\frac{3}{60}=0.05\] \[\Rightarrow \,\,\,\,\,\,{{n}_{A}}=\frac{45}{18}=2.5\]we know that \[\frac{\Delta P}{P{}^\circ }={{x}_{B}}=\frac{0.05}{2.5+0.5}=0.0196=0.02\]


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