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JEE Main & Advanced Sample Paper JEE Main Sample Paper-13

  • question_answer
    Calculate the per cent dissociation of 0.15 M formic acid solution which is 0.1 M in HCI \[(p{{K}_{a}}\] of HCOOH = 3.7).

    A)  0.1662                 

    B)  0.1993           

    C)  0.3412                 

    D)  0.5126

    Correct Answer: B

    Solution :

          \[\Rightarrow \]  At equal \[{{(1-x)}^{2}}=9{{x}^{2}}\]          \[\Rightarrow \]  \[{{1}^{2}}+{{x}^{2}}-2x=9{{x}^{2}}\]Antilog \[\Rightarrow \] \[8{{x}^{2}}+2x-1=0\] \[\Rightarrow \] \[8{{x}^{2}}+4x-2x-1=0\] \[\Rightarrow \] % dissociation \[(2x+1)\,(4x-1)=0\] = 0.1995


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