JAMB Chemistry 2025 Objective — Question 29
Question 29 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2025 Objective paper, with the correct answer and a full explanation.
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Which of the following carbohydrates gives a positive Benedict's test?
- A. Sucrose
- B. Starch
- C. GlucoseCorrect
- D. Cellulose
Explanation
Benedict's test identifies reducing sugars. Glucose is a monosaccharide (reducing sugar) with a free aldehyde group that reduces Cu²⁺ to Cu⁺ (brick-red precipitate). Sucrose is a non-reducing sugar.
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