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KVPY Sample Paper KVPY Stream-SX Model Paper-30

  • question_answer
    Molal depression constant for a solvent is 4.0 K kg \[mo{{l}^{-1}}.\] The depression in the freezing point of the solvent for\[0.03\text{ }mol\text{ }k{{g}^{-1}}\] solution of \[{{K}_{2}}OS{{O}_{4}}\] is: (Assume complete dissociation of the electrolyte)

    A) 0.36 K

    B) 0.18 K

    C) 0.12 K

    D) 0.24 K

    Correct Answer: A

    Solution :

    \[\Delta {{T}_{f}}=i{{k}_{f}}m\]
    \[=3(4)(0.03)\]
    \[\Delta {{T}_{f}}=0.36K.\]


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