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JAMB Biology 1984 Question 35

Question 35

Food Substances and Enzymes

Fehling's solution will readily change colour from blue to a reddish colour when it is

  1. A.mixed with sugar solution in the cold
  2. B.warmed or heated by itself
  3. C.mixed with reducing sugar in the cold
  4. D.Warmed or heated with a complex solution
  5. E.Warmed with a solution of reducing sugar.
Show the answer and explanation

Answer: E (Warmed with a solution of reducing sugar.)

Explanation

Fehling's test needs heat: a reducing sugar warmed with Fehling's solution gives a brick-red precipitate.