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

  • question_answer
    A solution is prepared by dissolving \[10g\text{ }NaOH\]in 1250 mL of a solvent of density 0.8 g/mL. The molality of the solution in mol \[k{{g}^{-1}}\]is

    A) 0.25                 

    B) 0.2   

    C) 0.008               

    D) 0.0064

    Correct Answer: A

    Solution :

    [a] Given w= 10 g, Mol. mass =40 g Weight of solvent \[=1250\times 0.8g=10000g\] =1 kg \[\therefore molality=\frac{10}{40\times 1}=0.25m\]


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