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JEE Main & Advanced Sample Paper JEE Main Sample Paper-21

  • question_answer
    Calculate the molar solubility of zinc tetrathio-  cyanato-N-mercurate (II) if its \[{{K}_{SP}}=2.2\times {{10}^{-7}}.\]

    A)  0.00380                       

    B)  0.000469

    C)  0.0095            

    D)  0.0183

    Correct Answer: B

    Solution :

    \[Zn[Hg{{(NCS)}_{4}}\,\rightleftharpoons \,Z{{n}^{+2}}\,+[{{(Hg\,{{(NCS)}_{4}}]}^{2-}}\]\[\Rightarrow \,{{K}_{SP}}={{S}^{2}}\]\[\Rightarrow \,\,S=\sqrt{22\times {{10}^{-8}}}\,=4.69\times {{10}^{-4}}\,mol/L\]


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