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BCECE Engineering BCECE Engineering Solved Paper-2014

  • question_answer
    Which one of the following is the ratio of the  lowering of vapour pressure of 0.1 M aqueous solutions of \[\text{BaC}{{\text{l}}_{2}}\], \[\text{NaCl}\] and \[\text{A}{{\text{l}}_{2}}{{(S{{O}_{4}})}_{3}}\] respectively?

    A) 3 : 2 : 5                 

    B) 5 : 2 : 3  

    C) 5 : 3 : 2                                 

    D) 2 : 3 : 5

    Correct Answer: A

    Solution :

    Lowering of vapour pressure is a colligative property. It depends on the number of particles of the solute. \[BaC{{l}_{2}}\rightleftharpoons B{{a}^{2+}}+2C{{l}^{-}};\text{3 ions}\] \[NaCl\rightleftharpoons N{{a}^{+}}+C{{l}^{-}};\text{2 ions}\] \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\rightleftharpoons 2A{{l}^{3}}+3SO_{4}^{3-};\text{5 ions}\] Hence, the ratio of lowering of vapour pressure is 3: 2: 5.


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