JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2007

  • question_answer
        The molar solubility (in\[mol\text{ }{{L}^{-1}}\]) of a sparingly soluble salt\[M\,{{X}_{4}}\]is s. The corresponding solubility product is\[{{K}_{sp}}\]. s is given in terms of. \[{{K}_{sp}}\]by the relation

    A)  \[s={{({{K}_{sp}}/128)}^{1/4}}\]              

    B)  \[s={{(128{{K}_{sp}})}^{1/4}}\]

    C)  \[s={{(256{{K}_{sp}})}^{1/5}}\]

    D)  \[s={{({{K}_{sp}}/256)}^{1/5}}\]

    Correct Answer: D

    Solution :

                    For the solute \[{{A}_{x}}{{B}_{y}}xA+yB\] \[{{K}_{sp}}={{x}^{x}}{{y}^{y}}{{(s)}^{x+y}}\] \[M{{X}_{4}}{{M}^{4+}}+4{{X}^{-}}\] \[x=1,y=4\] \[\therefore \] \[{{K}_{sp}}={{(4)}^{4}}{{(1)}^{1}}{{(s)}^{5}}=256{{s}^{5}}\] \[\therefore \]  \[s={{\left( \frac{{{K}_{sp}}}{256} \right)}^{1/5}}\]


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