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JEE Main & Advanced Sample Paper JEE Main Sample Paper-11

  • question_answer
    How many times solubility of \[Ca{{F}_{2}}\]is decreased in \[4\times {{10}^{-3}}M\]KF (aq). solution as compare to pure water at \[25{}^\circ C\]. Given \[{{K}_{sp}}(Ca{{F}_{2}})=3.2\times {{10}^{-11}}.\]

    A)  50                                         

    B)  100

    C)  500                       

    D)  1000

    Correct Answer: B

    Solution :

     \[4{{S}^{3}}=3.2\times {{10}^{-11}}\]     \[S=2\times {{10}^{-4}}\] Let solubility of \[Ca{{F}_{2}}\] is x in KF solution. \[{{K}_{sp}}=x{{(2x+4\times {{10}^{-3}})}^{2}};\]                                               \[3.2\times {{10}^{-11}}=x\times {{10}^{-6}}\times 16\] \[x=2\times {{10}^{-6}}\]


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