BI-169
Food tests
Biology · Secondary 3 · Medium · Food tests
A student adds a few drops of an unknown solution to 2 cm³ of Benedict’s solution and heats it in a water bath. The mixture remains blue. She then adds the unknown solution to 2 cm³ of iodine solution. The mixture turns blue‑black. What does the unknown solution contain?
- reducing sugar only
- starch only
- both reducing sugar and starch
- neither reducing sugar nor starch
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