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

  • question_answer
    A mixture of weak acid is \[0.1\text{ }M\] in \[HCOOH\] \[({{K}_{a}}=1.8\times {{10}^{-4}})\] and \[0.1\text{ }M\] in \[HOCN\,\,({{K}_{a}}=3.1\times {{10}^{-4}})\] Hence, \[[{{H}_{3}}{{O}^{\oplus }}]\] is

    A) \[7.0\times {{10}^{-3}}M\]

    B) \[4.1\times {{10}^{-4}}M\]

    C) \[0.20M\]

    D) \[4.1\times {{10}^{-3}}M\]

    Correct Answer: A

    Solution :

    [a] \[[{{H}_{3}}{{O}^{+}}]=\sqrt{{{K}_{1}}{{C}_{1}}+{{K}_{2}}{{C}_{2}}}\] \[=\sqrt{1.8\times {{10}^{-4}}\times 0.1+3.1\times {{10}^{-4}}\times 0.1}\] \[=7\times {{10}^{-3}}M\]


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