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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Sample Paper Topic Test - Ionic Equilibrium

  • question_answer
    What is the minimum pH when \[Fe{{(OH)}_{3}},\] starts precipitating from a solution containing \[0.1M\text{ }FeC{{l}_{3}}\]? \[{{k}_{sp}}\] of \[Fe{{(OH)}_{3}}=8\times {{10}^{-13}}{{M}^{3}}(\log \text{ }2\text{ }=\text{ }0.3)\]

    A)         3.7

    B) 5.7   

    C) 10.3

    D) 8.3

    Correct Answer: C

    Solution :

    [c] \[8\times {{10}^{-13}}=[F{{e}^{3+}}]{{[O-H]}^{3}}\]
    \[[O{{H}^{-}}]=2\times {{10}^{-4}}\]
    \[pOH=4-\log 2=3.7\]
    \[pH=10.3\]


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