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JEE Main Chemistry question

ChemistryBiomoleculesJEE Main

In an amino acid, the carboxyl group ionizes at and the ammonium ion at . The isoelectric point of the amino acid is at pH

Answer: (A)

Solution

For a simple neutral amino acid with only these two ionisable groups, the isoelectric point is the average of the two flanking pKa values:

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Question ID VK-150805