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The increasing order of pKa of the following amino acids in aqueous solution is : Gly Asp Lys Arg

1. Asp < Gly < Lys < Arg
2. Arg < Lys < Gly < Asp
3. Gly < Asp < Arg < Lys
4. Asp < Gly < Arg < Lys

Correct answer: Asp < Gly < Lys < Arg

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