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fructose-blue to brick-red precipitate

glucose-unchanged (blue to blue)

lactose-unchanged

galactose-unchanged

ribose- blue to brick-red precipitate

sucrose-unchanged

starch-unchanged

this test is to identify the ketoses. thus, from the results, only fructose and ribose are ketoses. fructose is ketohexose as it changed color in 20 minutes whereas ribose is ketopentose as it changed color in 10 minutes only.

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