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NEET Sample Paper NEET Sample Test Paper-75

  • question_answer
    The solubility product of a salt having general formula\[{{\operatorname{MX}}_{2}} is 4 \times \,\,{{10}^{-}}^{12}\]. Their concentration of \[{{M}^{2+}}\] ion in the aqueous solution of the salt is

    A)  \[2\times {{10}^{-\,6}}\,M\]                

    B)  \[1\times {{10}^{-\,4}}\,M\]

    C)  \[1.6\times {{10}^{-\,4}}\,M\]              

    D)  \[4\times {{10}^{-\,6}}\,M\]

    Correct Answer: B

    Solution :

    \[M{{X}_{2}}\,\rightleftharpoons \,\,\underset{(s)}{\mathop{{{M}^{2\,+}}}}\,\,\,+\,\,\underset{(\,\,\,2s)}{\mathop{2{{X}^{-}}}}\,\] \[{{K}_{sp}}=[{{M}^{2+}}]{{[{{X}^{-}}]}^{2}}=(s)\times \,{{(2s)}^{2}}\] \[4\times 1{{0}^{-}}^{12}\,M=4{{s}^{3}}\] \[=1{{0}^{-\,4}}M\]


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