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12th Class Chemistry Biomolecules / जैव-अणु Question Bank MCQs - Biomolecules

  • question_answer
    In an amino acid, the carboxyl group ionizes at \[p{{K}_{{{a}_{1}}}}=2\centerdot 34\] and ammonium ion at \[p{{K}_{{{a}_{2}}}}=9\centerdot 60\]. The isoelectric point of the amino is

    A) \[5\centerdot 97\]

    B) \[2\centerdot 34\]

    C) \[9\centerdot 60\]

    D) \[6\centerdot 97\]

    Correct Answer: A

    Solution :

    Isoelectric point \[\left( pl \right)=\left( p{{K}_{{{a}_{1}}}}+p{{K}_{{{a}_{2}}}} \right)/2\] \[=(2\centerdot 34+9\centerdot 60)/2=5\centerdot 97\]


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