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NEET Chemistry Solutions / विलयन Question Bank Self Evaluation Test - Solutions

  • question_answer
    12 g of a nonvolatile solute dissolved in 108 g of water produces the relative lowering of vapour pressure of 0.1. The molecular mass of the solute is:

    A) 80                    

    B) 60   

    C) 20                    

    D) 40

    Correct Answer: C

    Solution :

    [c] \[\frac{P{}^\circ -{{P}_{s}}}{P{}^\circ }=\frac{n}{N}=\frac{w}{m}\times \frac{M}{W}\] \[0.1=\frac{12}{m}\times \frac{18}{108}\] \[m=\frac{12\times 18}{0.1\times 108}=20\]


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