Haryana PMT Haryana PMT Solved Paper-2011

  • question_answer
    The solubility product of \[PbC{{l}_{2}}\] at \[{{20}^{o}}C\] is \[1.5\times {{10}^{-4}}\]. Calculate the solubility.

    A)  \[3.75\times {{10}^{-4}}\]

    B)  \[3.34\times {{10}^{-2}}\]

    C)  \[3.34\times {{10}^{2}}\]

    D)  None of these

    Correct Answer: B

    Solution :

                    \[PbC{{l}_{2}}\underset{S}{\mathop{P{{b}^{2+}}}}\,+\underset{2{{S}^{2}}}{\mathop{2C{{l}^{-}}}}\,\] \[{{K}_{sp}}=S\times {{(2\,\,S)}^{2}}=4\,{{S}^{3}}\] \[S=\sqrt[3]{\frac{{{K}_{sp}}}{4}}=\sqrt[3]{\frac{1.5\times {{10}^{-4}}}{4}}=3.34\times {{10}^{-2}}\]


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