J & K CET Engineering J and K - CET Engineering Solved Paper-2015

  • question_answer
    If the solubility of a sparingly soluble salt\[\text{A}{{\text{X}}_{\text{2}}}\] is s mol/L, the solubility product is

    A) \[4{{s}^{3}}\]

    B)  \[8{{s}^{3}}\]

    C)  \[4{{s}^{2}}\]

    D) \[{{s}^{2}}\]

    Correct Answer: A

    Solution :

     \[A{{X}_{2}}\underset{s}{\mathop{{{A}^{2+}}}}\,+\underset{2s}{\mathop{2{{X}^{-}}}}\,\] \[{{K}_{Sp}}=[{{A}^{2+}}]{{[{{X}^{-}}]}^{2}}\] \[{{K}_{Sp}}=(s){{(2s)}^{2}}\] \[{{K}_{Sp}}=(s)(4{{s}^{2}})\] \[{{K}_{Sp}}=4{{s}^{3}}\]


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