JEE Main & Advanced Chemistry Equilibrium Question Bank Electrical conductors, Arrhenius theory and ostwald's dilution law

  • question_answer 0.2 molar solution of formic acid is ionized 3.2%. Its ionization constant  is              [MP PMT 1991]

    A)                 \[1\times {{10}^{-12}}\]

    B)                 \[2.1\times {{10}^{-4}}\]

    C)                 \[1.25\times {{10}^{-6}}\]            

    D)                 \[1\times {{10}^{-14}}\]

    Correct Answer: B

    Solution :

                    \[{{K}_{a}}=C{{\alpha }^{2}}=0.2\times {{\left( \frac{32}{100} \right)}^{2}}=2.048\times {{10}^{-4}}\].

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