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

  • question_answer The degree of dissociation of \[0.1\,M\,HCN\] solution is 0.01%. Its ionisation constant would be [RPMT 1999]

    A)                 \[{{10}^{-3}}\]  

    B)                 \[{{10}^{-5}}\]

    C)                 \[{{10}^{-7}}\]  

    D)                 \[{{10}^{-9}}\]

    Correct Answer: D

    Solution :

               \[HA\]⇌ \[{{H}^{+}}+{{A}^{-}}\]                                 \[K=C{{a}^{2}}=0.1\times {{({{10}^{-4}})}^{2}}={{10}^{-9}}\]

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