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JEE Main & Advanced Chemistry Solutions / विलयन Question Bank Elevation of boiling point of the solvent

  • question_answer
    The elevation in boiling point of a solution of 13.44g of CuCl2 in 1kg of water using the following information will be                 (Molecular weight of CuCl2 = 134.4 and Kb­ = 0.52 K molal-1) [IIT 2005]

    A)                 0.16       

    B)                 0.05

    C)                 0.1         

    D)                 0.2

    Correct Answer: A

    Solution :

               DTb = i.Kb.m                    CuCl2 \[\xrightarrow{{}}\] Cu2+ + 2Cl-                    1                      0           0                    (1-a)             a           2a                            i = 1 + 2a                    Assuming 100% ionization                    So, i = 3                                 DTb = 3 ´ 0.52 ´ 0.1  = 0.156 » 0.16


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