0
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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