Lysine is least soluble in water in the pH range

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6 to 7

3 to 4

5 to 6

9 to 10

answer is D.

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Detailed Solution

Lysine is a basic amino acid, hence its pH (isoelectric point) lies in the basic range (8 to 9 or 10). At this pH amino acid has the least solubility in water and this property is exploited in the separation of different amino acids obtained from the hydrolysis of protein.

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