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KVPY Sample Paper KVPY Stream-SX Model Paper-30

  • question_answer
    What would be the molality of 20% (mass/mass) aqueous solution of \[KI?\] (molar mass of \[KI=166\text{ }g\text{ }mo{{l}^{-1}}\])

    A) 1.51

    B) 1.35

    C) 1.08

    D) 1.48

    Correct Answer: A

    Solution :

    20% w/w K.I.
    20 gm K.I. is 100 gm solution
    \[Molality=\frac{gm(solute)}{mw\times kg(sovlent)}\]
                \[=\frac{20\times 1000}{166\times 80}\]
    \[=1.506=1.51.\]


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