During a food testing practical, a Barbadian student obtained an orange colour when Benedict's solution was heated with a fruit juice sample. What does this result suggest about the concentration of reducing sugar?

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Question

During a food testing practical, a Barbadian student obtained an orange colour when Benedict's solution was heated with a fruit juice sample. What does this result suggest about the concentration of reducing sugar?

Accepted Answer

Moderate concentration of reducing sugar — Award 1 mark for understanding that Benedict's test gives a colour gradient: blue (negative) → green (trace) → yellow (low) → orange (moderate) → brick-red (high). D is incorrect — no reducing sugar would remain blue. A is incorrect — low concentration produces yellow/green. C is incorrect — high concentration produces brick-red.

Answer

High concentration of reducing sugar

Answer

Low concentration of reducing sugar

Answer

Moderate concentration of reducing sugar

Answer

No reducing sugar present

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