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NEET NEET SOLVED PAPER 2015 (C)

  • question_answer
    Which one of the following electrolytes has the same value of van't Hoffs factor (2) as that of \[A{{l}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}\] (if all are 100% ionized)?                                                                                                                                           

    A)  \[{{K}_{2}}S{{O}_{4}}\]                

    B)  \[{{K}_{3}}[Fe{{(CN)}_{6}}]\]

    C)                         \[Al{{(N{{O}_{3}})}_{3}}\]         

    D)         \[{{K}_{4}}[Fe{{(CN)}_{6}}]\]

    Correct Answer: D

    Solution :

    \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}2A{{l}^{3+}}+3SO_{4}^{2-}\] Value of Van?t Hoff?s factor \[(i)=5\] (a) \[{{K}_{2}}S{{O}_{4}}2{{K}^{+}}+SO_{4}^{2-}\]                                             \[(i=3)\] (b)\[{{K}_{3}}[Fe{{(CN)}_{6}}]3{{K}^{+}}+{{[Fe{{(CN)}_{6}}]}^{3-}}\]                        \[(i=4)\] (c)\[Al{{(N{{O}_{3}})}_{3}}A{{l}^{3+}}+3NO_{3}^{-}\]                                      \[(i=4)\] (d) \[{{K}_{4}}[Fe{{(CN)}_{6}}]4{{K}^{+}}+{{[Fe{{(CN)}_{6}}]}^{3-}}\]                       \[(i=5)\] Therefore, \[{{K}_{4}}[Fe{{(CN)}_{6}}]\] has same value of i that of \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\]i.e. \[i=5\]


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