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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 9

  • question_answer
    An electric current is passed through an aqueous solution (buffered at pH = 6.0) of alanine (pI = 6.0) and ariginine (pI = 10.2). The two amino acids can be separated because

    A) alanine migrates to anode, and arginine to cathode

    B) alanine migrates to cathode and arginine to anode

    C)  alanine does not migrate while arginine migrates to cathode

    D)  alanine does not migrate while arginine migrates to anode.

    Correct Answer: C

    Solution :

    [c] : At the given pH (6.0) of the solution, alanine (pI = 6.0), exists as a dipolar ion while arginine (pI = 10.2) exists as a cation. Hence, on passing an electric current, alanine will not migrate to any electrode while arginine will migrate to cathode.


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